Question

Spermatogenesis starts at the age of puberty due to significant increase in the secretion of

• A. GnRH from posterior pituitary gland
  
• B. GnRH from hypothalamus
  
• C. GnRH from anterior pituitary gland
  
• D. Somatostatin from hypothalamus
  

Answer 1

The correct option is B GnRH from hypothalamus


Spermatogenesis
Spermatogenesis is the process of formation of sperms from the spermatogonia in the testes in males.

Hormonal regulation of spermatogenesis
The process of spermatogenesis is under hormonal control as follows:
Spermatogenesis starts at puberty by the release of gonadotropin releasing hormone (GnRH) from hypothalamus.
GnRH acts on anterior pituitary to release gonadotropins, called luteinising hormone (LH) and follicle stimulating hormone (FSH).
LH acts on the interstitial cells (Leydig cells) of the seminiferous tubules to synthesise and secrete androgens (testosterone) which stimulates spermatogenesis.
FSH acts on sertoli cells to secrete androgen binding protein and inhibin.

Somatostatin
Somatostatin is produced by the delta cells of the Islets of Langerhans and some cells in gastrointestinal epithelium. It regulates the secretion of hormones from the anterior pituitary gland like growth hormone and thyroid stimulating hormone.

Hormones of posterior pituitary gland
Posterior pituitary gland produces hormones such as vasopressin (antidiuretic hormone) and oxytocin.