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Cornea transplant in humans is almost never rejected. This is because it has no blood supply. Cornea is a transparent layer of tissue, continuous with the sclerotic, that forms the front part of the vertebrate eye, over the iris and lens.

1. Cornea transplant is often rejected due to blood supply.
2. Cornea transplant in humans is almost never rejected.
3. Cornea transplant is rejected due to lack of transparency.
4. Cornea transplant is rejected due to its connection with the sclera.

Correct answer: Cornea transplant in humans is almost never rejected.

Solution

The cornea is avascular, meaning it lacks blood vessels. With fewer immune cells and antibodies reaching the transplanted tissue, the immune response is much weaker, so rejection is rare.

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