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Important Viva Voce Questions of 2nd year Physiology for MBBS students

Important Viva Voce Questions of 2nd year Physiology for MBBS students

  1. Which nerve is responsible for hearing and balancing? What is its pathway?

Ans : Vestibulocochlear nerve ( eight nerve)

Path : Auditory fibers are entering into dorsal and ventral cochlear nuclei in pons. Vestibular fibers are going to group of vestibular nuclei in pons and medulla.

2 – What is sound ?

ANs _ It is a form of energy produced by a vibrating object. A sound wave consists of compression and rarefraction of molecules of the medium (air, liquid or soild ) in which it travels.

3­—What is Frequency ?

Ans : It is the number of cycles per second. The unit of frequency is hertz. A sound of 1000Hz means 1000 cycles per second.

4 – What is Loudness?

Ans: It is the subjective sensation.

5 – What is intensity?

Ans : It is the strength of the sound which determines its loudness. It is usually measures in decibels. At a distance of 1 meter intensity of

Whisper = 30dB

Normal conversation = 600 dB

6 – What are primary sensations of taste?

Ans : Sour , salty, Sweet, Bitter

7-Where taste buds are located?

Ans : Taste buds are found are found on three types of papillae of the tongue, as follows.

  1. Large number of taste buds are on walls of throughs that surround the circumvallate papillae.
  2. Moderate no. of taste buds are on fungi from papillae over flat anterior surface.
  3. Moderate numbers are on the foliate papillae located in folds along lateral surface of tongue.
  4. Some taste buds are located on palate, few on pillars, on the epiglottis and even in proximal oesophagus.

8 – What is normal pupillary size?

Ans ; it is 3 –5 mm. It may be 1.5 mm on small side and 8 mm on large side.

9 –Why light thrown on one eye also causes the pupillary contriction of the opposite eye?

Ans ; Because fibers from pretectal nucleus pass to Edinger Westphal nucleus of both sides.

10 – If there is lesion of afferent pathway of one eye, what will happen to its consensual light reflex?

Ans : it will be normal.

11—Which cranial nerve carries the efferent fibers of light reflex.

12 – What is the function of hCG during pregnancy?

13—Name some of the diseases in which hCG is produced.

14 –What are different tests used to diagnose pregnancy?

15 –What are the primary and secondary colors?

Ans – Red , Blue and Green are primary colors.

16—What is the pattern of inheritance of red-green clor blindness?

Ans : It is an X-linked recessive disorder.

17—What is the significance of testing color vision?

Ans : it is used to find out color weakness or color blindness in individuals like pilots, drivers as fitness test.

18 –Which cranial nerve is associated with color vision?

Ans : Optic Nerve.

19 – What are normal light wavelengths for the sensitivity of primary colors?

Ans ; Blue 445nm

Green 535nm

Red 570nm

20 –Define visual acuity.

21—If the subjects is not able to see even the top most letter on snellen`s chart at 6 meter distance, what will you do?

22—What does visual acuity of 6/60 means?

23—What od difference between 6/60 and 6/6 vision?

24 –Define the field of vision.

25—What is the extent of normal field of vision?

26—What is anopia?

27—What os homonymous hemianopia?

28—What is heteronymus hemianopia?

29—Enumerate the factors affecting the field of vsison?

30—What is the cause of physiological scotoma (blind spot) ?

31—What is the location of physiological blind spot?

32—What happens to the field of vision in the optic atrophy?

33—Why spectacles are removed during perimetry?

34—What changes take place in eye during accomodation reflex?

35—What is pathway of accommodation reflex?

36—At which distance should the tip of finger held from the subject?