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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

When the concentration of thyroid hormone in the blood increases, it:

a. inhibits TSH secretion by the pituitary.

b. stimulates TRH secretion by the hypothalamus.

c. stimulates the pituitary to secrete TRH.

d. stimulates the pituitary to secrete TSH.

e. activates a positive feedback loop.

Summary Introduction

Introduction:

Feedback pathways regulate the secretion of various hormones. Most of these are negative feedback regulation. In negative feedback regulation, the product of the pathway inhibits the formation of one of the metabolites in the pathway. The thyroid gland’s secretion is regulated by negative feedback regulation.

Explanation

Justification for the correct answer:

Option (a) is given as “inhibits TSH secretion by the pituitary.” This option is correct as the thyroid-releasing hormone (TRH) is secreted by the secretory neurons in the hypothalamus. In response to this hormone, the pituitary gland releases thyroid stimulating hormone. It is the regulator of the thyroid hormone. When the concentration of thyroid hormone increases in the blood, the secretion of TSH gets inhibited. Hence, option (a) is correct.

Justification for the incorrect answers:

Option (b) is given as “stimulates TRH secretion by the hypothalamus.” This is false, as the thyroid hormone does not stimulate the release of TRH hormone. So, it is an incorrect option...

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