Question

one function of the immune system is to attack the foreign cells to protect the body. in organ transplants, the body recognizes that the new organ is made of foreign cells. what kind of medicine would you give a patient to increase the chances of transplant success?
medicine that makes the immune system less effective.
medicine that makes the immune system more effective.
medicine that allows the immune system to produce and secrete hormones.
medicine that allows the immune system to regulate nerve responses.

Explanation:

When a new organ (with foreign cells) is transplanted, the immune system attacks it. To increase transplant success, we need to reduce this immune - attack. A medicine that makes the immune system less effective will decrease its ability to recognize and attack the foreign organ cells. A more effective immune system (Option 2) would increase rejection. The immune system does not produce hormones (so Option 3 is wrong) and it does not regulate nerve responses (Option 4 is wrong).

Answer:

Medicine that makes the immune system less effective.