Question

chapter 15 multiple choice question 30
1 part | -- of 1 point

2 tries left

ordinarily, it is not possible to transplant tissues from one person to another, yet corneas can be transplanted without tissue rejection. this is because the cornea ______.

○ is not a living tissue
○ has no blood supply
○ has no nerve supply
○ does not contain connective tissue

Explanation:

To solve this, we analyze each option:

• Option 1: The cornea is a living tissue (it has living cells like corneal epithelial cells), so this is incorrect.
• Option 2: The cornea has no blood supply (it gets nutrients from tears and aqueous humor). Since the immune system's cells (which cause rejection) are carried in blood, a tissue with no blood supply is less likely to trigger an immune response. This matches why corneas can be transplanted without rejection.
• Option 3: The cornea does have a nerve supply (trigeminal nerve), so this is incorrect.
• Option 4: The cornea does contain connective tissue (the stroma is mainly connective tissue), so this is incorrect.

Answer:

B. has no blood supply