Question

Identify the hormones "$A$', '$B$' and '$C$' that are labelled in the given flow chart.

• A. $A-GnRH,B-ICSH,C-FSH$
• B. $A-GH,B-FSH,C-LH$
• C. $A-GnRH,B-PRL,C-ICSH$
• D. $A-GnRH,B-FSH,C-LH$

Answer 1

The correct option is D $A-GnRH,B-FSH,C-LH$

• The label A refers to GnRH. Gonadotropin-releasing hormone is shortly abbreviated as GnRH.
• This hormone is also called as follicle-stimulating hormone-releasing hormone (FSH-RH) and Luteinizing hormone-releasing hormone (LH-RH). GnRH is secreted in the neurons of the hypothalamus. It stimulates the anterior pituitary gland to release two hormones. The label B refers to FSH and label C refers to LH.
• The FSH (Follicle-stimulating hormone) and LH (Luteinizing hormone) are called gonadotropins. These are the hormones are released by the pituitary gland.
• The FSH stimulates the growth of the follicle cells in the ovary. This causes the development of the follicle to produce the ovum which is a female gamete.
• There is an effect of LH on the ovary which causes ovulation. The effect of FSH on the testes causes the production of sperms. The LH stimulates the testes to produce androgens.
• The androgens have a role in the development of secondary sexual characters.

Thus, the correct answer is option D.