Question

Which one of the following best describes the negative feedback regulation of the tropic hormones from the pituitary gland?

A. when hormone A stimulates the release of hormone B, hormone B inhibits the release of hormone C

B. when hormone A inhibits the release of hormone B, hormone B inhibits the release of hormone C

C. when hormone A stimulates the release of hormone B, hormone B inhibits the release of hormone A

D. when hormone A stimulates the release of hormone B, hormone B stimulates the release of hormone A

E. when hormone A inhibits the release of hormone B, hormone B inhibits the release of hormone A

Answer 1

Answer

Option C) When hormone A stimulates the release of hormone B, hormone B inhibits the release of hormone A

• Negative feedback includes the response in which the original stimulus is inhibited.
• Hypothalamus release regulatory hormones that stimulates release of tropic hormones from pituitary gland. Tropic hormones exert negative feedback on hypothalamus to inhibit release of regulatory hormone.
• Example : TRH (thryotropin releasing hormone) from hypothamaus stimulates the release of TSH (Thyroid stimulating hormone) from anterior pituitary gland.
  TSH exerts negative feedback on hypothalamus to inhibit release of TRH.