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Neural Control and Coordination · Question 57

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following statements is the characteristic of human cornea?

  1. It is secreted by conjunctiva and glandular layer.
  2. It is a lacrimal gland which secretes tears.
  3. Blood circulation is absent in cornea.
  4. In old age it becomes the cause of cataract.

Answer

(3) Blood circulation is absent in cornea.

Solution

The cornea is the transparent anterior part of the sclera (outer fibrous layer); it is not secreted by the conjunctiva and is not a gland.

It has no blood vessels (avascular) and gets nourishment from the aqueous humour and tears; hence corneal grafts are rarely rejected.

Cataract is the opacity of the lens, not of the cornea.

∴ Blood circulation is absent in cornea.

Answer: (3)

Out of syllabusAIPMT 2001

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2

Depolarization of axolemma during nerve conduction takes place because of

  1. equal amount of Na+ and K+ move out across axolemma
  2. Na+ move inside and K+ move more outside
  3. more Na+ outside
  4. none of these
AIPMT 2000
3

Which food should be eaten during deficiency of rhodopsin in eyes?

  1. Carrot and ripe papayas
  2. Guava, banana
  3. Mango and potato
  4. None of the above
Out of syllabusAIPMT 2000

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