Question

(a) Draw a sectional view of a seminiferous tubule of human. Label sertoli cell, spermatagonia and leydig cell on it and write their functions.
(b) Explain the role of pituitary and sex hormones in the process of spermatogenesis

Answer 1

Answer: (a)

• Sertoli cells provide nutrition to the germ cells (spermatogonia).
• Spermatogonia also known as male germ cells undergo meiotic division finally leading to sperm formation.
• Leydig cells synthesise and secret testicular hormone called androgens .

Other immunologically competent cells are also present .

(B)

Spermatogenesis starts at the age of puberty due to significant increase in the situation of gonadotropin-releasing hormone (GnRH).

The increased levels of gonadotropin then acts at the anterior pituitary gland and stimulates the secretion of two Gonadotropins - lutenising hormone (LH) and follicle stimulating hormone (FSH).

LH acts at the leydig cells and stimulates synthesis and secretion of androgens . Androgens stimulate the process of spermatogenesis . FSH Acts on the sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis .

THAT'S IT!

Hope it helps!