NADPH is a product of the hexose monophosphate pathway (HMP) in the red blood cell. The NADPH is used for the

Correct Answer: B

Rationale: The hexose monophosphate pathway (HMP) generates NADPH in RBCs, primarily to maintain reduced glutathione (B), which protects against oxidative stress by neutralizing reactive oxygen species. Fatty acid synthesis (A) occurs in other tissues, ATP formation (C) is via glycolysis, oxygen radical removal (D) is indirect via glutathione, and 2,3-BPG modulation (E) is unrelated—glutathione reduction is the direct role.

Correct Answer: B

Rationale: The testicles are paired organs, with one on each side of the scrotum, making 'is a pair organ' correct. They are not part of the spermatic ducts (which transport sperm), are not typically located in the pelvis (they descend into the scrotum), and while they are somewhat ovoid, 'pair organ' is the most defining characteristic here.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.