Download WBUHS MBBS First Year 2019 July Physiology Paper I Question Paper

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The West Bengal University of Health Sciences
MBBS 1st Professional Examination, July 2019

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Subject: Physiology
Paper: I

Full Marks: 50
Time: 2 ½ hours

Attempt all questions. The figures in the margin indicate full marks.

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Group A

1. a) What are the different types of chemoreceptors regulating ventilation? How are they stimulated? List the pathways by which increased Pco2 stimulates ventilation. 3+4+5
   or
   b) What are the two determinants of Cardiac Output? What do you understand by preload and afterload as applied to cardiac function? Mention the factors influencing them. What is ejection fraction? 2+4+4+2

Group B

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2. Answer any two of the following: 2 X7
   1. Enumerate the muscle proteins. Explain briefly the sliding filament theory of muscle contraction. What is Rigor Mortis? 1+4+2
   2. How is oxygen transported in blood? Explain with a diagram the effect of PO2 on hemoglobin saturation. Comment on the effect of Carbon Monoxide on oxygen binding to hemoglobin. 2+3+2
   3. Draw a flow chart showing different stages of erythropoiesis with diagrammatic representation. Add a note on erythropoietin. 5+2

Group C

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3. Write a brief account on any four: 4X3
   1. Salivary secretion.
   2. Rh incompatibility
   3. Presynaptic inhibition
   4. Pacemaker potential
   5. Gastro-colic reflex

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Group D

4. Give the physiological explanation of the following: 4x3
   1. Hypoproteinemia causes edema.
   2. Tetanus can be demonstrated easily in a skeletal muscles.
   3. pH of urine rises after a heavy meal.

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   4. Subendocardial region of the left ventricle is specially vulnerable to ischemia.

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