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

  1. A
    It is a non-living layer.
  2. B
    Its cells are least penetrable by bacteria.
  3. C
    It has no blood supply.
  4. D
    It is composed of enucleated cells.

Solution & Step-by-step Explanation

The cornea is an avascular tissue (no blood vessels). Because there is no blood supply, the immune system's cells and antibodies cannot reach the transplant site easily, making it "immunologically privileged" and rarely subject to rejection.

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Cornea transplant in humans is almost never rejected. This is because:
A
It is a non-living layer.
B
Its cells are least penetrable by bacteria.
C
It has no blood supply.
D
It is composed of enucleated cells.

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