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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which activity is a step in the ovarian cycle?

a. FSH stimulates the pituitary to release GnRH.

b. When FSH and LH levels fall, the corpus luteum shrinks and the uterine lining breaks down.

c. Luteinizing hormone stimulates the uterus to makeprogesterone.

d. Estrogen levels initially have a positive feedback effect on thepituitary, which is followed by higher estrogen levels causingnegative feedback.

e. A fully developed corpus luteum inhibits uterine lininggrowth.

Summary Introduction

Introduction:

If fertilization has not taken place, the fully developed endometrium falls and is shed off. This is controlled by hormones, which govern the formation of the endometrium, ovulation, and another phenomenon. This is known as the monthly cycle, which has the ovarian and the menstrual cycle. The ovarian cycle includes the ovulation process while the menstrual cycle includes the menstruation or shedding of the endometrial lining.

Explanation

Justification/explanation for the correct answer:

Option (b) states that when FSH and LH levels fall, the corpus luteum shrinks and the uterine lining breaks down. The LH and FSH help in the development of the follicle into a mature follicle known as corpus luteum. The FSH and LH are released by the pituitary through stimulation from GnRH. With the fall in the levels of FSH and LH, the corpus luteum shrinks. This inhibits the production of progesterone, which gives negative feedback to the pituitary and the uterine lining breaks down. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) states that FSH stimulates the pituitary to release GnRH. The high levels of GnRH stimulate the pituitary to release the FSH and LH. These hormones regulate the maturation of follicles. So, it is an incorrect option.

Option (c) states that luteinizing hormone stimulates the uterus to make progesterone...

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