Aiims Physiology - 10 Past Questions

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| By Kar

Kar, Assistant Professor (Biochemistry)

Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi

Quizzes Created: 33 | Total Attempts: 47,616

Questions: 10 | Attempts: 332 | Updated: Mar 21, 2023

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Questions and Answers

1.

Chymotrypsinogen is a
- A.
  
  Zymogen
- B.
  
  Exopeptidase
- C.
  
  Transpeptidase
- D.
  
  None of the above
Correct Answer
A. Zymogen

Explanation
Chymotrypsinogen is classified as a zymogen because it is an inactive precursor form of the enzyme chymotrypsin. Zymogens are synthesized and stored in cells until they are needed, at which point they are activated by specific cleavage of peptide bonds to become active enzymes. In the case of chymotrypsinogen, it is converted into the active enzyme chymotrypsin by cleavage of a specific peptide bond. This activation process is important for regulating the activity of enzymes and preventing them from causing damage or digesting their own cells.

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2.

Mean Arterial Pressure is
- A.
  
  (SPB+DBP)/3
- B.
  
  (SPB+2DBP)/3
- C.
  
  (SPB+3DBP)/2
- D.
  
  None of the above
Correct Answer
B. (SPB+2DBP)/3

Explanation
The correct answer is (SPB+2DBP)/3. Mean Arterial Pressure (MAP) is calculated by taking the sum of the Systolic Blood Pressure (SPB) and twice the Diastolic Blood Pressure (DBP), and then dividing it by 3. This formula is used to estimate the average blood pressure in a person's arteries during a single cardiac cycle. By including both the systolic and diastolic pressures, the formula provides a more accurate representation of the overall pressure exerted on the arterial walls.

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3.

FALSE about glomerular capillary blood flow
- A.
  
  Glomerular oncotic pressure > general oncotic pressure
- B.
  
  Glomerular oncotic pressure < general oncotic pressure
- C.
  
  Glomerular oncotic pressure = general oncotic pressure
- D.
  
  None of the above
Correct Answer
B. Glomerular oncotic pressure < general oncotic pressure

Explanation
The glomerular oncotic pressure refers to the pressure exerted by proteins in the glomerular capillaries. The general oncotic pressure refers to the pressure exerted by proteins in the systemic circulation. In a normal situation, the glomerular oncotic pressure is lower than the general oncotic pressure. This is because some proteins are filtered out of the glomerular capillaries into the renal tubules, leading to a decrease in oncotic pressure. Therefore, the correct answer is "Glomerular oncotic pressure < general oncotic pressure."

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4.

Catecholamines act through
- A.
  
  Four pass receptor
- B.
  
  Single pass receptor
- C.
  
  Seven pass receptor
- D.
  
  Voltage gated ion channel receptor
Correct Answer
C. Seven pass receptor

Explanation
GPCR/serpentine receptors

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5.

Least likely physiological change in pregnancy
- A.
  
  Increase in intra vascular volume
- B.
  
  Increase in stroke volume
- C.
  
  Increase in cardiac output
- D.
  
  Increase in peripheral vascular resistance
Correct Answer
D. Increase in peripHeral vascular resistance

Explanation
Pregnancy is a high output state !

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6.

Uterine flow at term
- A.
  
  50 ml/min
- B.
  
  100 – 150 ml/min
- C.
  
  350 – 375 ml/min
- D.
  
  500 – 750 ml/min
Correct Answer
C. 350 – 375 ml/min

Explanation
During pregnancy, the uterus receives a rich blood supply to support the growing fetus. Uterine flow refers to the amount of blood flowing through the uterus per minute. At term, which is the final stage of pregnancy, the uterus requires a higher blood flow to meet the demands of the developing baby. The range of 350-375 ml/min is considered the correct answer because it represents the appropriate uterine flow at this stage.

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7.

During moderate exercise, blood flow to brain,
- A.
  
  Increases
- B.
  
  Decreases
- C.
  
  No Effect
- D.
  
  First increases then decrease
Correct Answer
C. No Effect

Explanation
During moderate exercise, blood flow to the brain remains unaffected. This is because the body's autoregulatory mechanisms work to maintain a constant blood flow to the brain regardless of the level of physical activity. These mechanisms ensure that the brain receives a steady supply of oxygen and nutrients, allowing it to function optimally during exercise. Therefore, the blood flow to the brain does not increase or decrease during moderate exercise, hence the answer is "No Effect".

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8.

Which is not a second messenger?
- A.
  
  CAMP
- B.
  
  Guanylyl cyclase
- C.
  
  IP3
- D.
  
  Diacylglycerol
Correct Answer
B. Guanylyl cyclase

Explanation
Guanylyl cyclase is not a second messenger. Second messengers are molecules that transmit signals from the cell surface to the interior, amplifying and relaying the signal. cAMP, IP3, and diacylglycerol are all examples of second messengers, as they are involved in signal transduction pathways. Guanylyl cyclase, on the other hand, is an enzyme that produces the second messenger cyclic GMP (cGMP) in response to extracellular signals. Therefore, it is not a second messenger itself.

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9.

Kinemyograhy is used for
- A.
  
  Monitoring of neuromuscular function
- B.
  
  Monitoring of muscle spindle activity
- C.
  
  Monitoring of Exercise capacity
- D.
  
  None
Correct Answer
A. Monitoring of neuromuscular function

Explanation
Kinemyography (KMG) is a technique used for monitoring neuromuscular function. It involves the measurement and analysis of muscle movements and contractions to assess the function and activity of the neuromuscular system. KMG can provide valuable information about muscle strength, coordination, and response to stimuli, making it useful in various clinical and research settings. This technique helps in evaluating and diagnosing neuromuscular disorders, monitoring the progress of rehabilitation programs, and assessing the effects of interventions or treatments on muscle function.

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10.

Which is NOT related with menstrual changes in humans
- A.
  
  Hormonal changes
- B.
  
  Vaginal cytology changes
- C.
  
  Endometrial cycle
- D.
  
  Estrous cycle
Correct Answer
D. Estrous cycle

Explanation
Estrous cycle happens in animals !

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Current Version
Mar 21, 2023

Quiz Edited by
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Aug 12, 2013

Quiz Created by
Kar

Aiims Physiology - 10 Past Questions

Chymotrypsinogen is a

Mean Arterial Pressure is

FALSE about glomerular capillary blood flow

Catecholamines act through

Least likely physiological change in pregnancy

Uterine flow at term

During moderate exercise, blood flow to brain,

Which is not a second messenger?

Kinemyograhy is used for

Which is NOT related with menstrual changes in humans