Question at position 61 What is the role of inhibin in the ovarian cycle?It stimulates LH secretionIt supports progesterone synthesisIt triggers ovulationIt inhibits FSH release from the anterior pituitary

Question

BlackTom AI · Accepted Answer

When evaluating the role of inhibin in the ovarian cycle, different options point to various endocrine actions.
Option 1: 'It stimulates LH secretion' – Inhibin is not known for boosting LH; LH is primarily regulated by GnRH and feedback from estrogen and progesterone. This statement misattributes a stimulatory effect to LH that inhibin does not have. 
Option 2: 'It supports progesterone synthesis' – Progesterone production is largely a function of the corpus luteum and LH signaling, not a direct action of inhibin. While hormonal networks are interconnected, inhibin’s main action is not to enhance progesterone synthesis. 
Option 3: 'It triggers ovulation' – Ovulation is driven mainly by a surge in LH triggered by rising estrogen from the dominant follicle, not by inhibin. This option confuses the abrupt LH peak with an action that inhibits follicular maturation and ovulation. 
Option 4: 'It inhibits FSH release from the anterior pituitary' – This is the classic role of inhibin: produced by granulosa cells of growing follicles, inhibin selectively suppresses FSH secretion from the anterior pituitary, helping regulate follicular development and prevent excessive FSH activity. 
In summary, only the fourth option aligns with the established function of inhibin in the ovarian–hypophyseal axis, while the other statements misstate inhibin’s primary actions or omit the key regulatory pathway.

Question at position 61 What is the role of inhibin in the ovarian cycle?It stimulates LH secretionIt supports progesterone synthesisIt triggers ovulationIt inhibits FSH release from the anterior pituitary单项选择题

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