MBBS DEGREE EXAMINATION - 1st PROF PROFESSIONAL
SUPPLEMENTARY EXAM - MARCH 2024
PHYSIOLOGY - PAPER ? I
SECTION A - Multiple Choice Questions (MCQs)
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PAPER CODE: 2421130002 SET: ANote: Choose one correct answer in the OMR sheet provided. No overwriting
should be done.
Time: 20 Minutes (20 x 1 = 20 MARKS)
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1. Under normal respiratory conditions, the greatest resistance to airflowoccurs in:
a) Alveolar duct
b) Nose
c) Large bronchi
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d) Terminal bronchiole2. The difference in the amount of oxygen present in 100 ml of arterial blood
and 100 ml of venous blood at rest is approximately:
a) 20 ml
b) 5 ml
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c) 19.4 mld) 14.4 ml
3. J receptors are situated in:
a) Heart
b) Blood vessels
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c) Alveolar interstitiumd) Carotid body
4. Tall T waves of ECG are associated with:
a) Hypernatremia
b) Hypokalemia
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c) Hyponatremiad) Hyperkalemia
5. The velocity of transmission is fastest through which part of the heart?
a) AV node
b) Bundle of His
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c) Atriad) Purkinje fibers
6. The substance essential for the transfer of fatty acids across the
mitochondrial membrane:
a) Co-enzyme A
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b) Creatininec) Creatine
d) Carnitine
7. The biggest cell in the bone marrow is:
a) Reticulocytes
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b) Megakaryocytesc) Erythrocytes
d) Metamyelocytes
8. Which cells of the gastric mucosa secrete pepsinogen?
a) Zymogen cells
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b) Goblet cellsc) Parietal cells
d) Argentaffin cells
9. ECF volume is measured by using:
a) Insulin
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b) Inulinc) Evans blue
d) DO
10. The all-or-none response in a nerve is applicable to:
a) A sensory nerve
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b) A mixed nervec) A single nerve fiber
d) A motor nerve
11. Which of these is NOT a part of the extracellular matrix?
a) Fibronectin
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b) Lamininc) Collagen
d) Integrins
12. The nerve fiber easily blocked by local anesthetics is:
a) A beta
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b) C typec) A alpha
d) A gamma
13. Hyperbaric oxygenation is useful in all EXCEPT:
a) Congenital heart disease
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b) Gas gangrenec) Nitrogen toxicity
d) CO-poisoning
14. The first reactive change to occur after hemorrhage is:
a) Tachycardia
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b) Vasoconstrictionc) Raised cortisol
d) Raised epinephrine
15. Which of the following can be measured by using the helium dilution
method?
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a) Functional residual capacityb) Tidal volume
c) Dead space
d) Total lung volume
16. The increase in vascular permeability responsible for 'wheal' formation in
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the triple response is due to:a) Serotonin
b) Acetylcholine
c) Histamine
d) Adrenaline
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17. Which one of the following tissues has gap junctions?a) Cardiac muscles
b) Skeletal muscles
c) Neurons
d) Epithelial cells
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18. Thick filaments in skeletal muscle are composed of:a) Troponin
b) Actin
c) Myosin
d) Tropomyosin
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19. Which of the following techniques is used to study current flow across asingle ion channel?
a) Patch-clamp
b) Voltage-clamp
c) Ionophoresis
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d) Galvanometry20. Which of the following does not stimulate the peripheral chemoreceptor?
a) Hypoxia
b) Hypocapnia
c) Acidosis
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d) Convulsion****