MCAT Biology Question 29: Answer and Explanation
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Question: 29
14. During which phase of the menstrual cycle does progesterone concentration peak?
- A. Follicular phase
- B. Ovulation
- C. Luteal phase
- D. Menses
Correct Answer: C
Explanation:
Progesterone peaks during the luteal phase, as it supports the endometrium for potential implantation of a blastula. Progesterone levels are relatively low during follicular phase and ovulation, eliminating choices (A) and (B). Withdrawal of progesterone actually causes menses, eliminating choice (D).