Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 39, Problem 8TY
Summary Introduction

Introduction:

Theovarian cycle explains changes in ovary follicles. The ovarian cycle controls the release of eggs and endocrine tissue preparation. It is also called an endometrial cycle. It occurs from puberty to menopause. It is a cycle of cyclical changes occurring in a woman's reproductive tract with a periodicity of 28 days.

Ovulation is the discharge of eggs from the ovaries into the fallopian tube. It usually happens about 13-15 days before the start of each menses. This takes place when the ovarian follicles get rupture and discharge the secondary oocyte ovarian cells.

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Which of the following describes the role of Luteinizing hormone in the ovarian cycle? o Inhibits the hypothalamus from secreting GNRH o Directly promotes thickening of the endometrium o Simulates the ovary to increase aldosterone o Induces the corpus luteum to secrete progesterone Stimulates lactation in the mammary glands
Spermatogenesis is cyclic and exhibits spermatogenic wave inside the seminiferous tubules. Which of the following factor contribute to the spermatogenic cycle/wave? Retinoic acid signaling in the testis. AR levels in Sertoli cells. Activin and inhibin levels within the seminiferous tubule. Androgen receptor (AR) levels in Leydig and peritubular cells. Testosterone levels in the lumen of the seminiferous tubules.
Listed in the table below are the five major reproductive hormones that support ovulation in female mammals, including the giant panda. Describe the role of each hormone in this process and the approximate time during the ovarian cycle that it reaches peak levels. Hormone Gonadotropin-releasing hormone (GnRH) Estrogen Luteinizing hormone (LH) Follicle stimulating hormone (FSH) Progesterone Role in Regulation of the Menstrual Cycle Timing of Peak Level
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