The Reproductive System

Question 9 • 2025-2026_MDCPS_2000315_Biology_1_B-CR

Patient 1 and patient 2 both had a transplant. Which most likely explains why patient 1 had a successful transplant and patient 2 did not?

Answer

Patient 1 underwent tissue typing, but patient 2 was tested for antigen compatibility.

Patient 1 underwent long-term immunosuppressive therapy, but patient 2 was given immunosuppressants during the surgery.

Patient 1 began an exercise routine after surgery and maintained it for the rest of his life, but patient 2 led a more sedentary lifestyle.

Patient 1 followed a healthy diet low in salt and fat, but patient 2 did not monitor his diet.

Explanation

After a transplant, the recipient’s immune system may recognize the donated organ as foreign and attack it. Long-term immunosuppressive therapy helps prevent this rejection, while immunosuppressants given only during surgery may not protect the organ afterward. Therefore, patient 1’s long-term treatment most likely explains the successful transplant; patient 2’s limited treatment could have allowed rejection.

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