Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
12th Edition
ISBN: 9780135755785
Author: Gerald Audesirk, Teresa Audesirk
Publisher: PEARSON+
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Chapter 42, Problem 4MC
Summary Introduction

Introduction:

The menstrual cycle involves the periodic changes that occur in the uterus and ovary that makes pregnancy possible. The menstrual cycle is required to prepare the uterus for pregnancy. The entire menstruation process is regulated by the hormonal changes.

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In a menstrual cycle that does not result in pregnancy,a. LH stimulates follicle development early in the cycle.b. GnRH stimulates follicle development late in the cycle.c. ovulation typically occurs a day or two beforemenstruation.d. negative feedback by estrogen and progesterone inhibitsthe secretion of GnRH.
Which of the following statements about the menstrual cycle is false? a. Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. b. Menstruation occurs just after LH and FSH levels peak. c. Menstruation occurs after progesterone levels drop. d. Estrogen levels rise before ovulation, while progesterone levels rise after.
Which of the following statement does NOT describe the event that occurs if the ovum is not fertilized? Select one: A. Progesterone maintains the endometrium for the zygote. B. Low level of progesterone results in menstruation. C. The corpus luteum degenerates and stops producing estrogen and progesterone. D. GnRH, FSH, and LH levels begin to increase.
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