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Characteristic feature of human cornea
A
Secreted by conjunctiva and glandular
B
It has lacrimal gland which secretes tears
C
Blood circulation is absent in cornea
D
In old age it becomes hard and a white layer is deposited on it which causes cataract
Detailed Solution
The cornea is the transparent front part of the sclera. It has no blood vessels (it is avascular); it gets oxygen and nutrients from the aqueous humour and tears.
This lack of blood vessels keeps it transparent, and is also why corneal transplants are rarely rejected.
Tears are secreted by the lacrimal glands, not by the cornea; cataract is the opacity of the lens, not the cornea.
So the characteristic feature is that blood circulation is absent in the cornea.
This lack of blood vessels keeps it transparent, and is also why corneal transplants are rarely rejected.
Tears are secreted by the lacrimal glands, not by the cornea; cataract is the opacity of the lens, not the cornea.
So the characteristic feature is that blood circulation is absent in the cornea.