1.
A cross bridge is formed when myosin heads bind to
Correct Answer
B. Actin
Explanation
A cross bridge is formed when myosin heads bind to actin. Actin is a protein that is part of the thin filaments in muscle fibers. When a muscle contracts, the myosin heads attach to the actin filaments and pull them closer together, causing the muscle to shorten. This binding of myosin to actin forms a cross bridge, which allows for the sliding of the thin and thick filaments, resulting in muscle contraction.
2.
A distinction between motor neurons and sensory neurons is that
Correct Answer
C. Motor neurons carry information away from the central nervous system, whereas sensory neurons carry information to the central nervous system.
Explanation
Motor neurons and sensory neurons have different roles in the nervous system. Motor neurons carry information away from the central nervous system, transmitting signals from the brain and spinal cord to muscles and glands in the peripheral nervous system. On the other hand, sensory neurons carry information to the central nervous system, transmitting signals from sensory receptor cells (such as those in the skin, eyes, ears, etc.) to the brain and spinal cord for processing and interpretation. This distinction highlights the direction of information flow in these two types of neurons.
3.
A movement that decreases angle between articulating bones
Correct Answer
A. Flexion
Explanation
Flexion refers to a movement that decreases the angle between articulating bones. It typically occurs in the sagittal plane, such as when bending the elbow or knee. During flexion, the bones come closer together, reducing the angle between them. This movement allows for increased range of motion and flexibility in the joints.
4.
All of the following are functions of the skin EXCEPT:
Correct Answer
B. Negative feedback control of blood pressure
Explanation
The skin performs several important functions, including vitamin D synthesis, thermoregulation, acting as a barrier against infection, and sensation. However, it does not directly control blood pressure through negative feedback mechanisms. Blood pressure is primarily regulated by the cardiovascular system, specifically the heart and blood vessels.
5.
Burns that affect all layers of the skin and may not be painful due to the damage to nerve endings are classified as
Correct Answer
C. Third degree, full thickness
Explanation
Third degree burns, also known as full thickness burns, affect all layers of the skin, including the epidermis, dermis, and subcutaneous tissue. These burns are characterized by the destruction of the skin and underlying tissues, resulting in a dry, leathery appearance. Nerve endings may be damaged, leading to a lack of pain sensation in the affected area. First and second degree burns do not penetrate as deeply and are typically associated with pain and blistering.
6.
Cooling the surface of the skin and producing perspiration is the primary function of
Correct Answer
D. Sudoiferous gland activity
Explanation
The correct answer is sudoriferous gland activity. Sudoriferous glands, also known as sweat glands, are responsible for cooling the surface of the skin and producing perspiration. When the body temperature rises, these glands release sweat, which evaporates from the skin and helps regulate body temperature. This process is essential for maintaining the body's thermoregulation and preventing overheating.
7.
Excessive exposure to UV light may damage
Correct Answer
D. All of the above
Explanation
Excessive exposure to UV light can indeed damage cellular DNA, leading to mutations. This can also affect connective tissue and cause wrinkling. Furthermore, UV light can damage chromosomes, which can potentially lead to cancer. Therefore, all of the above options are correct explanations for the potential damage caused by excessive UV light exposure.
8.
Formed by Schwann cells in the PNS?
Correct Answer
D. Myelin Sheath
Explanation
The myelin sheath is formed by Schwann cells in the peripheral nervous system (PNS). It is a protective covering that surrounds and insulates the axons of neurons, allowing for faster and more efficient transmission of electrical signals. The myelin sheath is essential for the proper functioning of the nervous system, as it helps to prevent signal loss and interference. The nodes of Ranvier, on the other hand, are small gaps in the myelin sheath where the axon is exposed. Unmyelinated axons do not have a myelin sheath at all. Dendrites, on the other hand, are the branch-like extensions of neurons that receive signals from other neurons.
9.
Homeostasis can be defined as the existence and maintenance of a relatively constant enviroment within the body.
Correct Answer
A. True
Explanation
Homeostasis refers to the ability of an organism to maintain a stable internal environment despite changes in the external environment. It involves various physiological processes that work together to regulate body temperature, pH levels, blood sugar levels, and other vital parameters within a narrow range. This ensures that cells and organs can function optimally. Therefore, the statement "Homeostasis can be defined as the existence and maintenance of a relatively constant environment within the body" is true.
10.
How many pairs of cranial nerves are there?
Correct Answer
B. 12 pairs
Explanation
There are 12 pairs of cranial nerves in the human body. These nerves originate from the brain and are responsible for various functions such as sensory perception, motor control, and autonomic functions. Each pair serves a specific region or function in the head and neck, including vision, hearing, smell, taste, and facial movements. The cranial nerves are essential for the proper functioning of the nervous system and play a crucial role in maintaining overall health and well-being.
11.
Imagine a line drawn between the eyes to make a right and left side, what type of plane would that be considered?
Correct Answer
B. Sagittal
Explanation
The line drawn between the eyes to create a right and left side divides the body into two equal halves. This type of plane is called a sagittal plane. The sagittal plane divides the body into left and right portions and is commonly used in anatomical and medical terminology to describe the orientation and location of structures within the body.
12.
In a car accident, a person sustained major trauma to his brain and the spinal cord
region of his neck. Damage, in this case, was mainly to areas of the
Correct Answer
C. Central nervous system
Explanation
The central nervous system consists of the brain and spinal cord, which are responsible for processing and transmitting information throughout the body. In this car accident scenario, the person sustained major trauma to both the brain and the spinal cord, indicating damage to the central nervous system. This damage can have significant consequences on various bodily functions, including both autonomic (involuntary) and somatic (voluntary) functions. Therefore, the correct answer is central nervous system.
13.
In a patient with Spinal Muscular Atrophy, the most frequent cause of death is ________________________.
Correct Answer
B. Respiratory infection
Explanation
In patients with Spinal Muscular Atrophy, respiratory infection is the most frequent cause of death. This is because the muscles responsible for breathing become progressively weaker in this condition, making the patient more susceptible to respiratory infections. These infections can lead to complications such as pneumonia, which can be life-threatening for individuals with Spinal Muscular Atrophy.
14.
In the anatomical position the subject
Correct Answer
D. Is standing upright facing the observer with the palms forward.
Explanation
In the anatomical position, the subject is standing upright facing the observer with the palms forward. This position is commonly used as a reference point in anatomy and is characterized by the body being erect, arms by the sides, and palms facing forward. It allows for consistent and standardized communication when describing the location and orientation of various body parts.
15.
In the diagram, where are the ridges that serve as fingerprints?
Correct Answer
A. A
Explanation
The ridges that serve as fingerprints are located in area A.
16.
In the diagram, where is the arrector pili muscle?
Correct Answer
B. D
Explanation
The arrector pili muscle is located at the base of the hair follicle, and its main function is to contract and cause the hair to stand up, resulting in "goosebumps" when we are cold or experiencing strong emotions. In the given diagram, option D is the correct answer as it shows the location of the arrector pili muscle.
17.
In the diagram, where is the sebaceous gland?
Correct Answer
A. C
Explanation
The sebaceous gland is located at position C in the diagram.
18.
Information in neurons usually flows in what order?
Correct Answer
B. Dendrites, soma, axon
Explanation
Neurons are specialized cells that transmit information in the form of electrical signals. The information typically flows in a specific order within a neuron. Dendrites are the branch-like structures that receive signals from other neurons and transmit them to the soma, which is the cell body of the neuron. The soma integrates these signals and generates an electrical impulse. This impulse then travels down the axon, a long fiber-like structure, which transmits the signal away from the soma. Therefore, the correct order of information flow in neurons is dendrites, soma, and then axon.
19.
Jimmy went ice skating and fell and hit his head. After he got up he had problems with his vision. What structure of the brain was most likely affected?
Correct Answer
A. Occipital Lobe
Explanation
The occipital lobe is responsible for processing visual information. Since Jimmy experienced problems with his vision after hitting his head, it is likely that the occipital lobe, which is involved in visual processing, was affected by the fall.
20.
John has some paralysis and loss of sensation in his right side after a motorcycle
accident. It is likely that there is brain damage in the
Correct Answer
A. Left hemispHere
Explanation
Based on the given information, John has paralysis and loss of sensation in his right side. This condition is known as hemiplegia, which is commonly caused by damage to the opposite side of the brain. Therefore, it is likely that there is brain damage in the left hemisphere, which controls the right side of the body.
21.
Label B
Correct Answer
D. Pectoralis Major
Explanation
The correct answer is Pectoralis Major. Pectoralis Major is a large, fan-shaped muscle located in the chest region. It is responsible for movements of the shoulder joint, such as flexion, adduction, and medial rotation. This muscle is commonly targeted in exercises like bench press and push-ups to strengthen and develop the chest muscles.
22.
Label G is on
Correct Answer
C. Sartorius
Explanation
The correct answer is Sartorius. This suggests that the label G is indicating the muscle called the Sartorius.
23.
Label I is on
Correct Answer
B. Tibialis
Explanation
The correct answer is Tibialis because the question states that "Label I is on" and the only option labeled as I is Tibialis. Therefore, Tibialis is the correct answer.
24.
Label J is on
Correct Answer
A. Gastrocnemius
Explanation
The correct answer is Gastrocnemius because it is the only muscle listed that is commonly known to be located in the calf area. The other muscles listed are located in different areas of the body.
25.
Label M is on
Correct Answer
D. Latissimus Dorsi
26.
Label O is on
Correct Answer
B. Deltoid
Explanation
The correct answer is "Deltoid" because the question states that "Label O is on" and the options given are different muscle names. Among these options, "Deltoid" is the only muscle that is commonly labeled as "O" in anatomical diagrams. Therefore, "Deltoid" is the correct answer.
27.
Majority of Internuerons are found where?
Correct Answer
B. Brain
Explanation
The majority of interneurons are found in the brain. Interneurons are a type of neuron that primarily function to connect sensory and motor neurons within the central nervous system. While some interneurons can also be found in the spinal cord, the brain is where the majority of these neurons are located. Therefore, the correct answer is "Brain".
28.
Melanocytes
Correct Answer
A. Produce melanin, a brown/black pigment that absorbs UV-light.
Explanation
Melanocytes are responsible for producing melanin, which is a brown/black pigment that absorbs UV-light. This pigment helps to protect the skin from the harmful effects of UV radiation by absorbing and scattering the UV rays. It acts as a natural sunscreen, preventing damage to the DNA in skin cells and reducing the risk of skin cancer. Melanin also gives color to the skin, hair, and eyes, providing protection against sunburn and other UV-related skin problems.
29.
Melanoma, the most deadly form of skin cancer may ________________________, or spread to other organs including the brain.
Correct Answer
C. Metastisize
Explanation
Melanoma, the most deadly form of skin cancer, may metastasize, or spread to other organs including the brain.
30.
Mr. Donelson was burning leaves in the fire pit in his backyard and they would not stay lit. He decided to throw lighter fluid on the leaves and was subsequently engulfed in flames. He burned his right arm, right leg, and back. What percentage of body surface area was burned?
Correct Answer
C. 45
Explanation
The correct answer is 45. The question states that Mr. Donelson burned his right arm, right leg, and back. Since these are all separate areas of the body, we can assume that they are being considered individually. Therefore, the percentage of body surface area burned would be the sum of the percentages for each body part. We don't have any information about the size or proportion of each body part, so we can't make any specific calculations. However, based on the given options, 45 is the closest to the sum of the percentages for three body parts.
31.
Mrs. Donelson's son was climbing on the baseball dugout and fell, landing on his arm and breaking his ulna. When looking at the x-ray, it looked like a tree branch that and not broken completely in half. This type of fracture, common in children is known as a _________________________ fracture.
Correct Answer
C. Greenstick
Explanation
A greenstick fracture is a type of fracture commonly seen in children where the bone bends and cracks but does not completely break. This is similar to how a tree branch can bend and crack but not break completely in half, as mentioned in the question.
32.
Muscle contraction that generates movement by shortening the muscle is called
Correct Answer
A. Isotonic
Explanation
Isometric doesn't move and Flexion is a type of movement
33.
Name the body region of the lower back between the ribs and pelvis.
Correct Answer
D. Lumbar
Explanation
The correct answer is Lumbar. The lumbar region refers to the lower back area between the ribs and the pelvis. It is an important region of the spine and is responsible for providing support and stability to the upper body while allowing for flexibility and movement.
34.
Neurotransmitter in muscle contraction...
Correct Answer
D. Acetylcholine
Explanation
Acetylcholine is the correct answer because it is a neurotransmitter that plays a crucial role in muscle contraction. When released by motor neurons at the neuromuscular junction, acetylcholine binds to receptors on muscle fibers, leading to the generation of an action potential and subsequent muscle contraction. Without acetylcholine, the communication between the nerves and muscles would be disrupted, resulting in paralysis or muscle weakness.
35.
Skin hair and nails are associtated with the _________________ system
Correct Answer
D. Integumentary
Explanation
The correct answer is integumentary. The integumentary system is responsible for protecting the body from external threats, such as pathogens and physical damage. It includes the skin, hair, and nails, which all work together to provide a barrier against harmful substances and maintain body temperature. The integumentary system also plays a role in sensory perception and the production of vitamin D.
36.
Somatic Nervous System:
Correct Answer
A. Controls voluntary activities such as skeletal muscle
Explanation
The somatic nervous system is responsible for controlling voluntary activities, such as the movement of skeletal muscles. This means that it allows us to consciously control our body movements, such as walking or picking up objects. It does not control involuntary activities, such as the functioning of the digestive system, which is regulated by the autonomic nervous system. The somatic nervous system uses neurotransmitters to transmit signals from the brain to the skeletal muscles, allowing for precise control over muscle actions.
37.
Support, protection of soft tissues, mineral storage, and blood formation are functions of which system
Correct Answer
A. Skeletal
Explanation
The skeletal system is responsible for support, protection of soft tissues, mineral storage, and blood formation. The bones provide structure and support to the body, protecting the internal organs and soft tissues. The skeletal system also acts as a reservoir for minerals such as calcium and phosphorus, which are important for various bodily functions. Additionally, the bone marrow within the bones is responsible for the production of blood cells, including red blood cells, white blood cells, and platelets. Therefore, the skeletal system is the correct answer for this question.
38.
Tendon connects
Correct Answer
C. Muscle to bone
Explanation
Tendons are tough, fibrous connective tissues that connect muscles to bones. They play a crucial role in transmitting the force generated by the muscle to the bone, allowing movement to occur. This connection is necessary for the coordinated movement of the skeletal system, as the muscles contract and pull on the bones to generate movement. Therefore, the correct answer is "muscle to bone."
39.
Terms that refer to the backside of the body include
Correct Answer
D. Dorsal:Posterior
Explanation
The terms "dorsal" and "posterior" both refer to the backside of the body. "Dorsal" specifically refers to the back or upper side, while "posterior" refers to the back or rear side. Therefore, the correct answer is "Dorsal: Posterior."
40.
The anatomical term which best describes a structure toward the head is
Correct Answer
D. Superior.
Explanation
The anatomical term "superior" refers to a structure that is located above or toward the head. In this context, it means that the structure being described is positioned higher or closer to the head than other structures. Therefore, "superior" is the best term to describe a structure located toward the head.
41.
The arm is _________ to the hand.
Correct Answer
C. Proximal
Explanation
The term "proximal" is used to describe a body part that is closer to the point of attachment or origin. In this case, the arm is closer to the point of attachment (shoulder) than the hand, making the arm proximal to the hand.
42.
The arrector pili muscle will stand up the hair on the skin when the skin is cold.
Correct Answer
A. True
Explanation
The arrector pili muscle is a small muscle attached to the hair follicle. When the body is exposed to cold temperatures, the muscle contracts, causing the hair to stand up on the skin. This is commonly known as "goosebumps" or "piloerection." This physiological response helps to trap a layer of air near the skin, providing insulation and helping to keep the body warm. Therefore, the statement that the arrector pili muscle will stand up the hair on the skin when the skin is cold is true.
43.
The back portion of the skull is located in which body region?
Correct Answer
A. Occipital
Explanation
The back portion of the skull is located in the occipital region. The occipital bone is a flat, curved bone that forms the back of the skull and protects the brain. It is situated at the lower part of the skull, behind the parietal and temporal bones. The occipital region is important for providing support and protection to the brain and also plays a role in housing the foramen magnum, a large opening through which the spinal cord passes.
44.
The big toe or hallux is _______ to the little toe.
Correct Answer
A. Medial
Explanation
The big toe or hallux is located closer to the midline of the body compared to the little toe.
45.
The body region "brachial" is making reference to which area of the body?
Correct Answer
D. Upper Arm
Explanation
The term "brachial" is commonly used to refer to the upper arm region of the body. Therefore, the correct answer is Upper Arm.
46.
The body region called "inguinal" is referring to which area?
Correct Answer
B. Groin
Explanation
The body region called "inguinal" refers to the groin area. The groin is the area between the abdomen and the thigh on either side of the body. It is located in the lower part of the abdomen and is commonly known as the "groin" or "inguinal" region.
47.
The body region frontal is which area?
Correct Answer
B. Forehead
Explanation
The body region frontal refers to the forehead. This area is located at the front of the head, above the eyes and between the hairline and eyebrows. It is commonly associated with the frontal bone, which forms the front part of the skull. The forehead plays a role in facial expressions and is also a common area for wrinkles and lines to form due to aging.
48.
The chest is located in which body region?
Correct Answer
B. Thoracic
Explanation
The correct answer is Thoracic. The question is asking about the location of the chest, and the thoracic region refers to the area of the body where the chest is located. The other options listed are body regions associated with other parts of the body, such as the face (zygomatic), foot (pedal), elbow (olecranal), and nose (nasal).
49.
The clavicle articulates with the
Correct Answer
C. Manubrium and scapula
Explanation
The clavicle articulates with the manubrium and scapula. The clavicle is a long bone that connects the shoulder blade (scapula) to the sternum (manubrium). This joint is known as the sternoclavicular joint, where the clavicle articulates with the manubrium. Additionally, the clavicle also articulates with the acromion process of the scapula, forming the acromioclavicular joint. Therefore, the correct answer is manubrium and scapula.
50.
The correct order of the number of vertebrae in the spinal colum from cervical to coccyx is:
Correct Answer
A. 7, 12, 5, 5, 4