Neural Control and Coordination Question 58
58. Cornea transplant in humans is almost never rejected. This is because
[2008]
(a) its cells are least penetrable by bacteria
(b) it has no blood supply
(c) it is composed of enucleated cells
(d) it is a non-living layer
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Answer : b
Hints & Solutions
(b) 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. Complications of a corneal transplant can be significant and can include cornea graft rejection, eye infection and problems associated with the use of stitches. Rejection of the donor tissue is the most serious complication after a corneal transplant and occurs in 5 to 30 percent of patients.
