In the absence of a signal for implantation by days 16 to 18 of the estrous cycle, the uterus secretes prostaglandin causing the corpus luteum to regress between days 18 and 20. This describes CL regression occurring on which days?

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Multiple Choice

In the absence of a signal for implantation by days 16 to 18 of the estrous cycle, the uterus secretes prostaglandin causing the corpus luteum to regress between days 18 and 20. This describes CL regression occurring on which days?

Explanation:
Luteolysis is driven by uterine prostaglandin F2alpha when there’s no signal of pregnancy. If no implantation signal is received by about day 16–18, the uterus releases PGF2alpha, which triggers the corpus luteum to regress during the late luteal phase, typically between days 18 and 20. So the correct timing of CL regression is 18 to 20. Earlier (14–16) would occur too soon for the standard luteal lifespan, and later (20–22) would be after regression has already happened.

Luteolysis is driven by uterine prostaglandin F2alpha when there’s no signal of pregnancy. If no implantation signal is received by about day 16–18, the uterus releases PGF2alpha, which triggers the corpus luteum to regress during the late luteal phase, typically between days 18 and 20. So the correct timing of CL regression is 18 to 20. Earlier (14–16) would occur too soon for the standard luteal lifespan, and later (20–22) would be after regression has already happened.

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