The plasma concentration of estrogen reaches a higher level during the follicular phase than during the luteal phase, despite the fact that the follicle and corpus luteum both secrete estrogen.

Question

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During the follicular phase, the dominant follicle secretes increasing amounts of estrogen, leading to a higher plasma concentration. Although the corpus luteum also secretes estrogen during the luteal phase, the overall production is lower, leading to a lower plasma concentration.

The Plasma Concentration of Estrogen Reaches a Higher Level During