Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

Outline the roles of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the ovarian cycle of a human female.

Summary Introduction

To review:

The roles of FSH (follicle stimulating hormone) and LH (luteinizing hormone) in the ovarian cycle of a human female.


Ovarian cycle is the normal sex cycle in the female. It involves the development of follicles present within the ovaries. This cycle is also responsible for the ovulation, that is, the release of eggs from ovaries and the formation and deterioration of the corpus luteum.


The ovarian cycle is synchronized with the uterine cycle. In the uterine cycle, the uterus prepares to receive the fertilized egg. In human females, the cycle usually lasts with an average of 28 to 30 days. It produces a mature egg. The onset of the cycle is triggered by the release of GnRH (gonadotropin-releasing hormone) by the action of the hypothalamus.

The gonadotropin-releasing hormone trigger/stimulates the pituitary gland, in order to release LH and FSH into the bloodstream. These are glycoprotein polypeptide hormones. The follicle stimulating hormone is responsible for the release of the early ovum that is immature initially. FSH and LH stimulate the secretion of estrogen from the developing follicles, which by positive feedback increase the concentration of LH and FSH in body...

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