Download RGUHS MBBS 2023 February 1023 Physiology Paper II Rs 4 Previous Question Paper

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Rajiv Gandhi University of Health Sciences, Karnataka

MBBS Phase - I (CBME) Degree Examination - 11-Feb-2023

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Time: Three Hours Max. Marks: 100 Marks

PHYSIOLOGY - PAPER - II (RS-4)

Q.P. CODE: 1023

(QP contains two pages)

Your answers should be specific to the questions asked

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Draw neat, labeled diagrams wherever necessary

LONG ESSAYS 2 x 10 = 20 Marks

1. Trace the visual pathway. Explain the lesion that occur at different levels
2. Describe the structure of neuromuscular junction and explain the transmission across it. Add a note on neuromuscular blockers

SHORT ESSAYS 8 x 5 = 40 Marks

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3. Explain the steps in synthesis and regulation of thyroid hormone synthesis
4. Describe the mechanisms of heat loss and heat gain in the body
5. Describe the stages and regulation of spermatogenesis
6. A middle aged man reported to medical out-patient department with complaints of trembling of hands while attempting to do some work. On examination he was found to have impaired co-ordination and ataxia
   1. Describe the signs and symptoms of cerebellar disease
   2. Explain the tests used to assess cerebellar functions

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7. Explain the properties of sensory receptors
8. Describe the actions of insulin
9. Explain the action of glucocorticoids
10. Illustrate the pain pathway. Explain the gate control theory of pain

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SHORT ANSWERS 10 x 3 = 30 Marks

11. Explain the physiological significance of muscle spindle
12. Explain the clinical features that occur below the level of lesion in Brown - Sequard syndrome
13. List the functions of luteinizing hormones
14. What is Papez circuit?

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15. What is the basis of sex differentiation in a fetus?
16. Explain fetoplacental unit
17. Explain summation in synapse
18. List the functions of blood brain barrier
19. Differentiate between pituitary and thyroid dwarfs

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20. Justify the use of L-dopa in Parkinsonism

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Rajiv Gandhi University of Health Sciences, Karnataka

Multiple Choice Questions 10 x 1 = 10 Marks

21. i) Endolymph is secreted by
    1. Reissner’s membrane

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    2. Tectorial membrane
    3. Stria vascularis
    4. Outer hair cells
22. ii) Heteronymous hemianopia is seen in lesion of
    1. Optic chiasma

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    2. Lateral geniculate body
    3. Optic tract
    4. Optic nerve
23. iii) Spinocerebellar tract carries the sensation of
    1. Conscious Proprioception

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    2. Crude touch
    3. Unconscious Proprioception
    4. Pain
24. iv) Site of action of aldosterone on the renal tubule
    1. Proximal convoluted tubule

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    2. Loop of Henle
    3. Early distal convoluted tubule
    4. Collecting duct
25. v) The phase of menstrual cycle occurring after ovulation is
    1. Proliferative phase

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    2. Secretory phase
    3. Bleeding phase
    4. Midluteal phase

22. i) Chronaxie is increased when
    1. Excitability of tissue is low

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    2. Threshold of excitation is decreased
    3. Local excitatory state is present
    4. Membrane potential is near firing level
23. ii) Inverse stretch reflex
    1. Golgi tendon organ is receptor

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    2. Muscle length is detected
    3. Single synapse present
    4. Excitation of same alpha‘motor neuron is seen
24. iii) After hyperpolarisation in action potential is due to
    1. Opening of sodium channels

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    2. Opening of potassium channels
    3. Slow closure of sodium channels
    4. Slow closure of potassium channels
25. iv) The only situation when the neuron is directly exposed to the external environment is in
    1. Taste buds

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    2. Skin
    3. Cornea
    4. Olfactory mucous membrane
26. v) The action of cholecalciferol on intestinal transport of calcium is mediated through
    1. Troponin

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    2. Calbindin
    3. Calmodulin
    4. Cyclic AMP

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