Question

10. Explain how GnRH stimulates the production of sperm in males. * 11. Explain how insulin converts excess glucose in the body into fat. *

Answer 1

11. Insulin is a hormone released by beta cells of the pancreas which moves the glucose from the blood into the body cells to utilize for energy. If there is excess glucose, insulin converts into fatty acids and stored in the adipose tissue.

10. Gonadotrophin Releasing hormone in the hypothalamus stimulates the production of gonadotrophins, FSH, and LH. FSH stimulates Sertoli cells to increases the production of spermatozoa and is essential for maturation of spermatogenesis. Testosterone released by LH maintains the spermatogenesis. Inhibin hormone inhibits the production of FSH and LH.

9. Hormones secreted by a posterior pituitary gland

• oxytocin
• Antidiuretic hormone

Hormones secreted by Anterior pituitary gland

• Adenocorticotrophic hormone
• Follicle stimulating hormone
• Leitunizing hormone
• Growth hormone
• Thyroid stimulating hormone
• Prolactin
• Melanocyte-stimulating hormone.

8. One example of humoral stimuli: If the insulin reduces blood sugar level, then negative feedback mechanism signals to the pancreas to stop the production of insulin.

One example of neural stimulus: Stimulate the release of epinephrine and norepinephrine in response to stress through the sympathetic nervous activity.

One example of hormonal stimuli: Hypothalamus stimulates the anterior pituitary gland. The anterior pituitary gland stimulates thyroid stimulating hormone to produce T3 and T4.