Dr Gawad - Mid-module Exam Physiology
34 MCQs
40 min
- 1.
Parasympathetic function include
- A.
A stimulation of heart rate and force of contraction
- B.
Allowing the body to cope with an external threat
- C.
Constriction of bronchioles
- D.
Glycogenolysis and lipolysis
Correct Answer
C. Constriction of bronchiolesExplanation
The correct answer is constriction of bronchioles. Parasympathetic function involves the constriction of bronchioles, which helps in regulating airflow in the lungs. This narrowing of the airways can be a response to various stimuli, such as irritants or allergens, and is part of the body's defense mechanism to protect the respiratory system. This constriction reduces the diameter of the bronchioles, thereby limiting the flow of air and preventing the entry of harmful substances into the lungs.Rate this question:
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- 2.
Generallized sympathetic activity is characterized by all of the following EXCEPT
- A.
Contraction of the radial muscle of the iris
- B.
Increased secretion of catecholamines
- C.
Lipolysis in adipose tissue
- D.
Relaxation of sphincteric smooth muscle in the alimentary tract
Correct Answer
D. Relaxation of spHincteric smooth muscle in the alimentary tractExplanation
Generalized sympathetic activity is characterized by various physiological responses, such as contraction of the radial muscle of the iris, increased secretion of catecholamines, and lipolysis in adipose tissue. These responses are typically associated with the "fight or flight" response, where the body prepares for physical exertion or stress. However, relaxation of sphincteric smooth muscle in the alimentary tract is not a typical response of sympathetic activity. In fact, sympathetic stimulation usually leads to constriction of smooth muscle in the alimentary tract, reducing digestive activity and redirecting blood flow to other areas of the body.Rate this question:
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- 3.
Acetylcholine is released from all the following fibers EXCEPT
- A.
All preganglionic parasympathetic fibers
- B.
All preganglionic sympathetic fibers
- C.
All postganglionic sympathetic fibers
- D.
Preganglionic fibers suppling the adrenal medulla
Correct Answer
C. All postganglionic sympathetic fibersExplanation
Acetylcholine is a neurotransmitter that is released by nerve fibers to transmit signals between nerve cells. In the autonomic nervous system, acetylcholine is released from preganglionic fibers of both the parasympathetic and sympathetic divisions. However, in the sympathetic division, postganglionic fibers release norepinephrine instead of acetylcholine. Therefore, the correct answer is "all postganglionic sympathetic fibers" because they do not release acetylcholine.Rate this question:
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- 4.
The center of autonomic reflex arc is present in
- A.
Autonomic ganglia
- B.
Lateral horn cell
- C.
Anterior horn cell
- D.
Posterior horn cell
Correct Answer
B. Lateral horn cellExplanation
The correct answer is lateral horn cell. The center of the autonomic reflex arc is located in the lateral horn cell. This is because the lateral horn cell is responsible for controlling and coordinating the autonomic nervous system, which regulates involuntary bodily functions such as heart rate, digestion, and respiration. The lateral horn cell receives input from sensory neurons and sends output to the autonomic ganglia, which then transmit signals to the target organs to initiate the appropriate response. Therefore, the lateral horn cell plays a crucial role in the autonomic reflex arc.Rate this question:
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- 5.
Noradrenaline is released at
- A.
Motor end plate
- B.
Sympathetic ganglia
- C.
End of most postsynaptic sympathetic fibers
- D.
End of most postganglionic parasympathetic fibers
Correct Answer
C. End of most postsynaptic sympathetic fibersExplanation
Noradrenaline is released at the end of most postsynaptic sympathetic fibers. This is because noradrenaline is the primary neurotransmitter released by sympathetic neurons, which are part of the sympathetic nervous system. These neurons innervate various organs and tissues in the body and release noradrenaline at their synaptic terminals to transmit signals to target cells. Noradrenaline helps to activate the sympathetic response, which is responsible for the "fight or flight" response in the body. Therefore, the correct answer is "end of most postsynaptic sympathetic fibers".Rate this question:
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- 6.
The parasympathetic nervous system is characterized by the presence of terminal ganglia near the
- A.
Organs and by short postganglionic fibers
- B.
Organs and long postganglionic fibers
- C.
Spinal cord and by short postganglionic fibers
- D.
Splanchnic nerves
Correct Answer
A. Organs and by short postganglionic fibersExplanation
The parasympathetic nervous system is characterized by the presence of terminal ganglia near the organs and by short postganglionic fibers. This means that the ganglia, which are clusters of nerve cell bodies, are located close to the target organs. Additionally, the postganglionic fibers, which are the nerve fibers that extend from the ganglia to the organs, are relatively short in length. This arrangement allows for quick and localized responses to stimuli, as the signals do not have to travel far to reach the target organs.Rate this question:
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- 7.
Which autonomic receptors mediate secretion of epinephrine by the adrenal medulla
- A.
Adrenergic alpha 1 receptors
- B.
Adrenergic beta 1 receptors
- C.
Cholinergic muscarinic receptors
- D.
Cholinergic nicotinic receptors
Correct Answer
D. Cholinergic nicotinic receptorsExplanation
Cholinergic nicotinic receptors mediate the secretion of epinephrine by the adrenal medulla. These receptors are activated by acetylcholine, which leads to the release of epinephrine. Adrenergic alpha 1 receptors and adrenergic beta 1 receptors are not involved in this process. Cholinergic muscarinic receptors also do not play a role in the secretion of epinephrine by the adrenal medulla.Rate this question:
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- 8.
Stimulation of the vagus nerve causes
- A.
Inhibition of the internal anal sphincter
- B.
Secretion and vasodilation in the salivary glands
- C.
Mucous secretion from the bronchial mucosal cells
- D.
Contraction of the splenic capsule
Correct Answer
C. Mucous secretion from the bronchial mucosal cellsExplanation
Stimulation of the vagus nerve causes mucous secretion from the bronchial mucosal cells. The vagus nerve is responsible for regulating various functions in the body, including the respiratory system. When the vagus nerve is stimulated, it triggers the release of mucus from the bronchial mucosal cells. This helps to lubricate the airways and protect them from irritants, such as dust or bacteria. The increased mucous secretion can aid in clearing the airways and maintaining their proper functioning.Rate this question:
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- 9.
Which of the following responses is mediated by parasympathetic muscarinic receptors
- A.
Dilatation of bronchiolar smooth muscle
- B.
Erection
- C.
Ejaculation
- D.
Contraction of gastrointestinal sphincters
Correct Answer
B. ErectionExplanation
Erection is mediated by parasympathetic muscarinic receptors. When these receptors are stimulated, they cause the release of nitric oxide, which in turn leads to the relaxation of smooth muscles in the arteries of the penis. This relaxation allows for increased blood flow into the penis, resulting in an erection.Rate this question:
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- 10.
The sympathetic nervous system is characterized by all of the following EXCEPT
- A.
Has longer post ganglionic fibers than preganglionic ones
- B.
Is catabolic
- C.
Produces generalized effects
- D.
Has no divergence in autonomic ganglia
Correct Answer
D. Has no divergence in autonomic gangliaExplanation
The sympathetic nervous system is characterized by longer post ganglionic fibers than preganglionic ones, which means that the nerve fibers that transmit signals from the ganglia to the target organs are longer than the fibers that transmit signals from the central nervous system to the ganglia. It is also catabolic, meaning it promotes the breakdown of molecules for energy production. Additionally, it produces generalized effects throughout the body, affecting multiple organs and systems. However, the sympathetic nervous system does exhibit divergence in autonomic ganglia, meaning that preganglionic fibers can synapse with multiple postganglionic neurons, allowing for amplification of signals and widespread effects.Rate this question:
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- 11.
As regard refered pain, it can be explained by
- A.
Muller's law
- B.
Peripheral senstization
- C.
Convergence projection theory
- D.
Primary hyperalgesia
Correct Answer
C. Convergence projection theoryExplanation
Convergence projection theory provides an explanation for referred pain. According to this theory, sensory neurons from different regions of the body can converge or come together and send signals to the same area of the brain. This convergence can lead to confusion in the brain, causing the brain to interpret the pain signals from one area as originating from a different area. This is why pain may be felt in a different location than the actual source of the pain.Rate this question:
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- 12.
The cranial nerve nuclei which receive innervation only from the contralateral corticobulbar tract are
- A.
Nuclei of trigeminal and vagus nerves
- B.
Nuclei of vagus and glossopharyngeal nerves
- C.
Nuclei of facila and hypoglossal nerves
- D.
Nuclei of facial and glossopharyngeal nerves
Correct Answer
C. Nuclei of facila and hypoglossal nervesExplanation
The cranial nerve nuclei that receive innervation only from the contralateral corticobulbar tract are the nuclei of the facial and hypoglossal nerves. This means that the motor fibers from the contralateral side of the brain's motor cortex project exclusively to these nuclei, controlling the muscles of the face (facial nerve) and tongue (hypoglossal nerve) on the opposite side of the body. The other options are incorrect because they either include cranial nerve nuclei that receive bilateral innervation or include cranial nerves that do not receive innervation from the corticobulbar tract.Rate this question:
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- 13.
The somatosensory association area is
- A.
The center that recieves fine touch sensation
- B.
Located in the temporal and occipital lobe
- C.
Concerned with a meaning of sensations
- D.
The primary area for perception of pain
Correct Answer
C. Concerned with a meaning of sensationsExplanation
The somatosensory association area is concerned with the meaning of sensations. This means that it is responsible for interpreting and understanding the sensory information received from the primary somatosensory cortex. While the primary somatosensory cortex is responsible for detecting and processing basic touch sensations, the somatosensory association area takes it a step further by assigning meaning to these sensations. It helps us recognize objects, understand textures, and interpret the significance of the sensory input we receive.Rate this question:
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- 14.
Regarding Somatosensory cortical areas, which is false:
- A.
Somatosensory area I receives sensory radiation from ipsilateral thalamus
- B.
Astereognosis occurs due to lesion in somatosensory area I
- C.
Body representation in somatosensory area II is sharply localized
- D.
Somatic sensory association area is important for perceiving complex sensations
Correct Answer
C. Body representation in somatosensory area II is sharply localized -
- 15.
All of the following are correct regarding neurotransmitter EXCEPT
- A.
Released into the blood in response to a stimulus
- B.
Produced by and stored in presynaptic neurons
- C.
Binds to special receptors on post synaptic membrane
- D.
Eah neuron usually release only one type of neurotransmitter
Correct Answer
A. Released into the blood in response to a stimulusExplanation
Neurotransmitters are chemical messengers that are released by presynaptic neurons and bind to receptors on the post-synaptic membrane to transmit signals between neurons. They are not typically released into the blood in response to a stimulus. Instead, neurotransmitters are released into the synaptic cleft, the small gap between the presynaptic and postsynaptic neurons. From there, they diffuse across the cleft and bind to receptors on the postsynaptic membrane to transmit the signal.Rate this question:
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- 16.
In which of the following ascending pathways do the second order neurons decussate within the spinal cord
- A.
Fasciculus cuneate
- B.
Dorsal spinocerebellar tract
- C.
Fasiculus gracilis
- D.
Ventral spinothalamic tract
Correct Answer
D. Ventral spinothalamic tractExplanation
The ventral spinothalamic tract is the ascending pathway where the second order neurons decussate within the spinal cord. This means that the sensory information from one side of the body crosses over to the opposite side of the spinal cord. The other pathways listed (fasciculus cuneate, dorsal spinocerebellar tract, and fasciculus gracilis) do not involve decussation within the spinal cord.Rate this question:
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- 17.
It is correct to say
- A.
Thermoreceptors stop discharging above 45°C
- B.
Fine grades of temprature are transmitted by the gracile and cuneat tracts
- C.
Tonic receptors include tactile receptors
- D.
The coding of sensory information includes the disrimination of modality, locality and intensity of that sensation.
Correct Answer
D. The coding of sensory information includes the disrimination of modality, locality and intensity of that sensation.Explanation
The given answer is correct because it accurately states that the coding of sensory information involves the discrimination of modality, locality, and intensity of the sensation. This means that our sensory system is able to identify the type of sensory input (such as touch, taste, or smell), pinpoint its location, and determine its intensity (whether it is strong or weak). This coding process is essential for our perception and understanding of the sensory world around us.Rate this question:
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- 18.
About referred pain. All of the following are true EXCEPT
- A.
It is explained by the convergence facilitation theory
- B.
It always accompanies cutaneous pain
- C.
It is a major manifestation of visceral pain
- D.
It is felt in the somatic structure (dermatome) innervated by the same dorsal root that innervates the diseases viscous.
Correct Answer
B. It always accompanies cutaneous painExplanation
Referred pain refers to pain that is felt in a different area of the body than where the actual source of pain is located. It is not always accompanied by cutaneous pain, meaning pain on the skin or superficial tissues. Referred pain can occur without any cutaneous pain. The other options listed are true statements about referred pain: it is explained by the convergence facilitation theory, it is a major manifestation of visceral pain, and it is felt in the somatic structure innervated by the same dorsal root that innervates the diseased viscera.Rate this question:
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- 19.
Which of the following is true about the gate theory in the spinal cord
- A.
The gate is the synapse between the second and third order neurons of the pain pathway
- B.
When the gate is closed both the pain and touch pathways cannot discharge to the thalamus
- C.
It involves inhibition of pain signals by tactile stinulation of a skin surface
- D.
Acceleration of the heart after haemorrhage.
- E.
It involves release of acetylcholine from the brain stem to the soinal cord
Correct Answer
C. It involves inhibition of pain signals by tactile stinulation of a skin surfaceExplanation
The gate theory in the spinal cord involves the inhibition of pain signals by tactile stimulation of a skin surface. This means that when a person experiences pain, applying pressure or touch to the affected area can help alleviate the pain by blocking the pain signals from reaching the brain. This theory suggests that the brain can prioritize and interpret different sensations, and by stimulating the touch pathway, the pain pathway can be temporarily "closed" or inhibited, reducing the perception of pain.Rate this question:
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- 20.
Stimulation of of the medial part of the right primary somatosensory area will result in a sensation referred to
- A.
The right hand
- B.
The left foot
- C.
The right foot
- D.
The left hand
Correct Answer
B. The left footExplanation
Stimulation of the medial part of the right primary somatosensory area will result in a sensation referred to the left foot. This is because the primary somatosensory area in the brain is responsible for processing sensory information from different parts of the body. The left foot is represented in the right primary somatosensory area, meaning that stimulation of this area will result in a sensation felt in the left foot.Rate this question:
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- 21.
Which of the following is a property of the generator potential
- A.
It can be propagated along the sensory nerve fiber
- B.
It obeys all or none rule
- C.
Has a long refractory period
- D.
Becomes larger in amplitude if stimulus strenght increases
Correct Answer
D. Becomes larger in amplitude if stimulus strenght increasesExplanation
The generator potential refers to the initial depolarization of a sensory receptor in response to a stimulus. It is a graded potential, meaning its amplitude can vary depending on the strength of the stimulus. Therefore, the correct answer is that the generator potential becomes larger in amplitude if the stimulus strength increases.Rate this question:
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- 22.
Intracranial headache may result from all of the following clinical causes EXCEPT
- A.
Decreased CSF pressure
- B.
Spasm of scalp muscles
- C.
Distension of dura vinous sinuses
- D.
Pressure upon tentorium cerecri
Correct Answer
B. Spasm of scalp musclesExplanation
Intracranial headache may result from decreased CSF pressure, distension of dura vinous sinuses, and pressure upon tentorium cerecri. However, spasm of scalp muscles is not a clinical cause of intracranial headache.Rate this question:
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- 23.
Lesion of the dorsal column system most likely affect
- A.
Fine touch
- B.
Itch and tickle
- C.
Pain sensation
- D.
Temprature sensation
Correct Answer
A. Fine touchExplanation
A lesion of the dorsal column system is most likely to affect fine touch. The dorsal column system is responsible for transmitting sensory information related to touch, vibration, and proprioception. Fine touch refers to the ability to perceive subtle sensations, such as the texture or shape of an object. Damage to the dorsal column system can impair the transmission of these specific sensory signals, leading to a loss or reduction in fine touch perception.Rate this question:
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- 24.
Regarding spinal cord gate theory of pain, which is true:
- A.
Inhibitory neuron (which is relaying on the second order neuron of the lateral spinothalamic tract) is tonically inactive
- B.
Stimulation of nearby A myleinated fibers will activate second order neuron of the near spinothalamic pathway by inhibition of the interneuron.
- C.
Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.
- D.
None of the above
Correct Answer
C. Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.Explanation
According to the spinal cord gate theory of pain, the correct statement is that stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron. This theory suggests that the perception of pain can be modulated by the opening and closing of "gates" in the spinal cord. Stimulation of the C fibers, which are associated with pain signals, can inhibit the inhibitory interneuron, allowing pain signals to be transmitted to the brain. This helps explain why certain stimuli can either increase or decrease the perception of pain.Rate this question:
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- 25.
About hyperalgesia which of the following is true:
- A.
The pain receptor is rapidly adapting.
- B.
1ry hyperalgesia is due to central facilitation.
- C.
Secondary hyperalgesia is due to receptor hypersenstivity.
- D.
Area of flare is due to release of histamine from injured area
Correct Answer
D. Area of flare is due to release of histamine from injured areaExplanation
The area of flare is due to the release of histamine from the injured area. Histamine is a chemical mediator that is released during inflammation and injury. It causes blood vessels to dilate, leading to increased blood flow to the area, which results in redness and swelling. Histamine also sensitizes the nerve endings in the area, making them more responsive to pain stimuli, contributing to the development of hyperalgesia. Therefore, the release of histamine plays a role in the formation of the area of flare in hyperalgesia.Rate this question:
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- 26.
About the true visceral pain:
- A.
It is transmitted by somatic nerve fibers
- B.
Pain from the testis is conducted through dorsal column leminiscus pathway
- C.
Cardiac pain is conducted through sympathetic nerve fibers.
- D.
It is sharply localized.
Correct Answer
C. Cardiac pain is conducted through sympathetic nerve fibers.Explanation
Cardiac pain is conducted through sympathetic nerve fibers. This means that the pain signals originating from the heart are transmitted through the sympathetic nervous system. The sympathetic nerves play a role in the body's "fight or flight" response, and they are responsible for regulating various bodily functions, including the transmission of pain signals. Therefore, when someone experiences cardiac pain, it is conducted through these sympathetic nerve fibers. This helps to explain why cardiac pain can often be felt in areas such as the left arm, shoulder, or jaw, as these regions are innervated by the same sympathetic nerves.Rate this question:
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- 27.
Regarding cutaneous pain, which of the following is true:
- A.
Fast immediate cutaneous pain is transmitted by paleospinothalameic tract
- B.
Neospinothalamic tract is connected to the reticular formation
- C.
Sever cutaneous pain associated with hypotension
- D.
Lateral spinothalamic tract is specific only for cutaneous pain transmission
Correct Answer
C. Sever cutaneous pain associated with hypotensionExplanation
Severe cutaneous pain is associated with hypotension. When an individual experiences severe pain, it can trigger a physiological response known as the "fight or flight" response. This response includes an increase in heart rate, blood pressure, and respiratory rate. However, in some cases, severe pain can cause a drop in blood pressure, leading to hypotension. This can occur due to the activation of the body's pain pathways and the release of certain chemicals that can affect blood vessel tone and cardiac function.Rate this question:
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- 28.
Which of the following is not an unconscious kinesthetic sensation:
- A.
Sense of muscle tone.
- B.
Momentary state of muscle contraction.
- C.
Muscle length
- D.
Sense of joint movement.
Correct Answer
D. Sense of joint movement.Explanation
The sense of joint movement is not an unconscious kinesthetic sensation because it is a conscious proprioceptive sensation. Conscious proprioception refers to the awareness of the position and movement of our body parts, including our joints. In contrast, unconscious kinesthetic sensations, such as the sense of muscle tone, momentary state of muscle contraction, and muscle length, are not consciously perceived but are essential for maintaining balance, coordination, and posture.Rate this question:
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- 29.
The gracile pathway:
- A.
Transmits unconscious kinesthetic sensation
- B.
Its afferent is thin slow afferent
- C.
It runs in the spinal cord medially to the cuneat tract
- D.
Its transmission is perceived by the thalamus
Correct Answer
C. It runs in the spinal cord medially to the cuneat tractExplanation
The gracile pathway is a sensory pathway in the spinal cord that transmits unconscious kinesthetic sensation. It has thin slow afferent fibers and runs medially to the cuneate tract. The transmission of sensory information through the gracile pathway is perceived by the thalamus.Rate this question:
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- 30.
Regarding the ventral spinothalamic tract, which of the following is not true:
- A.
Its afferent fiber is type C fiber
- B.
The crossing of the tract to the midline is mainly in the second order neuron
- C.
It transmits crude touch.
- D.
The main centre of this tract is the thalamus
Correct Answer
D. The main centre of this tract is the thalamusExplanation
The main center of the ventral spinothalamic tract is not the thalamus. The ventral spinothalamic tract is responsible for transmitting pain and temperature sensations, not crude touch. The tract crosses to the midline mainly in the first-order neuron, not the second-order neuron. The afferent fibers of the ventral spinothalamic tract are type Aδ fibers, not type C fibers.Rate this question:
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- 31.
About receptor potential which of the following is true:
- A.
It obeys the all or none rule.
- B.
It is a form of partial depolarization.
- C.
Its absolute refractory period is too short
- D.
It is blocked by local anesthetics.
Correct Answer
B. It is a form of partial depolarization.Explanation
The receptor potential is a form of partial depolarization. This means that it does not follow the all or none rule, which is characteristic of action potentials. Unlike action potentials, which have a threshold and either occur fully or not at all, receptor potentials can vary in magnitude depending on the strength of the stimulus. Therefore, the correct answer is that the receptor potential is a form of partial depolarization.Rate this question:
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- 32.
Sensory ataxia is due to lesion of
- A.
Dorsal colum
- B.
;ateral colum
- C.
Ventral column
- D.
Posterolateral column
Correct Answer
A. Dorsal columExplanation
Sensory ataxia is a condition characterized by the loss of coordination and balance due to damage to the sensory pathways in the nervous system. The dorsal column, also known as the posterior column, is responsible for transmitting sensory information such as touch, vibration, and proprioception (awareness of body position) from the body to the brain. Therefore, a lesion or damage to the dorsal column can result in sensory ataxia, as it disrupts the normal transmission of sensory signals, leading to impaired coordination and balance.Rate this question:
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- 33.
Primary motor area (area 4), which is false
- A.
The body is represented in an inverted manner
- B.
Cortical representation of any part of the body in area 4 is directly proportional to its size
- C.
It is an area of high excitability
- D.
It contains large pyramidal
Correct Answer
B. Cortical representation of any part of the body in area 4 is directly proportional to its sizeExplanation
The correct answer is that the cortical representation of any part of the body in area 4 is directly proportional to its size. This means that the amount of space dedicated to a specific body part in area 4 is determined by the size of that body part. For example, the hands and face have larger representations in area 4 compared to the arms or legs. This is known as the somatotopic organization of the primary motor cortex, where different body parts are represented in a specific order.Rate this question:
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- 34.
Regarding corticospinal tracts, which of the following is true
- A.
Regulates gross limb movements
- B.
Its pathway from the cortex to the spinal cord involves multiple neurons and synapses
- C.
Only some of its tracts cross while many others descend directly
- D.
It functions is delayed after the first year of life
Correct Answer
D. It functions is delayed after the first year of lifeExplanation
The correct answer is that the function of corticospinal tracts is delayed after the first year of life. This means that the development and maturation of these tracts, which are responsible for fine motor control and voluntary movements, take time and are not fully functional until after the first year of life. This delay is due to the ongoing development of the nervous system during infancy and early childhood.Rate this question:
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