Cornea transplant in humans is rarely rejected.This is because:
Correct answer: D. It has no blood supply
- A. It is composed of enucleated cells
- B. It is a nonliving layer
- C. Its cells are least penetrable by bacteria
- D. It has no blood supply
Explanation
The cornea is a transparent portion that forms the anterior one-sixth of the eyeball. The cornea admits and helps to focus light waves as they enter the eye. The cornea is avascular (i.e., has no blood supply). This part of the eye absorbs oxygen from the air. The cornea was one of the first organs to be successfully transplanted because it lacks blood vessels.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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