Now-a-days cornea transplantation is very popular. The reason is that it

• is easy to preserve

• transplanted very easily

• can be easily obtained

• does not link with blood supply and immune system

Which part of retina consists of only cones?

• Fovea centralis

• optic nerve

• Blind spot

• Orasmata

Schwann cell is found around

• axon

• cyton

• dendrite

• dendron

Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?

• Valium

• Morphine

• Hashish

• Amphetamines

One of the examples of the action of the autonomous nervous system is

• knee-jerk response

• pupillary reflex

• swallowing of food

• peristalsis of the intestines

Reflex action involves

• spinal cord

• cerbellum

• medulla oblongata

• optic lobe

Ventricles are related to

• heart only

• brain only

• both 'a' and 'b'

• none of these

Which of the following is the part of mid brain of rabbit?

• Diencephalon

• Cerebrum

• Corpora quadrigemina

• None of the above

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

• nerve fibre is insulated by a medullary sheath

• sodium pump starts operating only at the cyton and then continues into the nerve fibre

• neurotransmitters are released by dendrites and not by axon endings

• neurotransmitters are released by the axon endings and not by dendrites.

Cornea transplant in humans is almost never rejected. This is because

• it is composed of enucleated cells

• it is a non-living layer

• its cells are least penetrable by bacteria

• it has no blood supply