Anatomy & Physiology: The Unity of Form and Function
Anatomy & Physiology: The Unity of Form and Function
8th Edition
ISBN: 9781259277726
Author: Kenneth S. Saladin Dr.
Publisher: McGraw-Hill Education
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Chapter 17, Problem 1TYR

CRH secretion would not raise the blood concentration of

  1. a. ACTH.
  2. b. thyroxine.
  3. c. cortisol.
  4. d. corticosterone.
  5. e. glucose.
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Summary Introduction

Introduction:

The hypothalamus synthesizes the releasing hormones and inhibitory hormones which control secretion or inhibition of hormones by the anterior pituitary. The hypothalamus secretes six hormones namely thyrotropin-releasing hormone (TRH), gonadotropin-releasing hormone (GnRH), prolactin-inhibiting hormone (PIH), corticotropin-releasing hormone (CRH), growth hormone–releasing hormone (GHRH), and somatostatin. These hormones regulate the synthesis of pituitary hormones (FSH, LH, TSH, ACTH, prolactin, and GH). The pituitary hormones control other endocrine glands.

Answer to Problem 1TYR

Correct answer:

Corticotropin-releasing hormone (CRH) secreted by the hypothalamus would not raise the thyroxine concentration in the blood. Thyrotropin-releasing hormone (TRH) from the hypothalamus promotes the release of thyroxine from the thyroid gland. Therefore, option b is correct.

Explanation of Solution

Justify reasons for the correct statement:

The thyroid follicular cells secrete thyroid hormones (TH) such as triiodothyronine (T3) and thyroxine (T4). The thyroid gland releases TH into the bloodstream. The secretion of thyroxine is not influenced by the CRH.

Option (b) is given as “thyroxine”.

CRH does not raise the thyroxine concentration in the blood.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “ACTH.

The hypothalamus releases the CRH, which stimulates the anterior pituitary to secrete adrenocorticotropic hormone (ACTH). Hence, it is a wrong answer.

Option (c) is given as “cortisol”.

CRH stimulates ACTH secretion by the anterior pituitary. ACTH promotes the adrenal cortex to release of cortisol (glucocorticoids). Hence, it is a wrong answer.

Option (d) is given as “corticosterone”.

CRH stimulates ACTH secretion by the anterior pituitary. ACTH promotes the adrenal cortex to release the corticosterone (glucocorticoids). Hence, it is a wrong answer.

Option (e) is given as “glucose”.

The hypothalamus secretes the CRH that stimulates the release of ACTH by the anterior pituitary. ACTH stimulates the adrenal cortex to secrete cortisol and corticosterone (glucocorticoids). Cortisol and corticosterone stimulate the catabolism of fat and protein and promote gluconeogenesis. Thereby, they increase glucose concentration into the blood. Hence, it is a wrong answer.

Hence, options (a), (c), (d), and (e) are incorrect.

Conclusion

CRH raises the concentration of ACTH, cortisol, corticosterone, and glucose in the blood, but not thyroxine.

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Chapter 17 Solutions

Anatomy & Physiology: The Unity of Form and Function

Ch. 17.2 - Prob. 6BYGOCh. 17.2 - Prob. 7BYGOCh. 17.2 - Prob. 8BYGOCh. 17.2 - In what sense does the pituitary take orders from...Ch. 17.2 - Prob. 10BYGOCh. 17.2 - Prob. 1AYLOCh. 17.2 - Prob. 2AYLOCh. 17.2 - Prob. 3AYLOCh. 17.2 - Two hormones synthesized in the hypothalamus and...Ch. 17.2 - Prob. 5AYLOCh. 17.2 - Two hormones secreted by the posterior pituitary,...Ch. 17.2 - Prob. 7AYLOCh. 17.2 - Prob. 8AYLOCh. 17.3 - Prob. 11BYGOCh. 17.3 - Prob. 12BYGOCh. 17.3 - Prob. 13BYGOCh. 17.3 - Prob. 14BYGOCh. 17.3 - Prob. 15BYGOCh. 17.3 - Prob. 16BYGOCh. 17.3 - Prob. 1AYLOCh. 17.3 - Prob. 2AYLOCh. 17.3 - Prob. 3AYLOCh. 17.3 - Anatomy of the parathyroid glands; their hormone...Ch. 17.3 - Prob. 5AYLOCh. 17.3 - Prob. 6AYLOCh. 17.3 - Three tissue zones of the adrenal cortex, the...Ch. 17.3 - Prob. 8AYLOCh. 17.3 - Prob. 9AYLOCh. 17.3 - Hormones produced by the following tissues and...Ch. 17.4 - What are the three chemical classes of hormones?...Ch. 17.4 - Prob. 18BYGOCh. 17.4 - Prob. 19BYGOCh. 17.4 - Prob. 20BYGOCh. 17.4 - Prob. 21BYGOCh. 17.4 - Prob. 1AYLOCh. 17.4 - Prob. 2AYLOCh. 17.4 - Prob. 3AYLOCh. 17.4 - Prob. 4AYLOCh. 17.4 - The Types of stimuli that elicit hormone...Ch. 17.4 - Thyroid hormone synthesis and secretionCh. 17.4 - Prob. 7AYLOCh. 17.4 - Prob. 8AYLOCh. 17.4 - Which hormones require second messengers to...Ch. 17.4 - How signal amplification enables small amounts of...Ch. 17.4 - How target cells modulate their hormone...Ch. 17.4 - Three kinds of interactions that can occur when...Ch. 17.4 - Prob. 13AYLOCh. 17.5 - Define stress from the standpoint of...Ch. 17.5 - Describe the stages of the general adaptation...Ch. 17.5 - Prob. 24BYGOCh. 17.5 - Prob. 1AYLOCh. 17.5 - Prob. 2AYLOCh. 17.5 - The three stages of the stress response; the...Ch. 17.6 - Prob. 25BYGOCh. 17.6 - Prob. 26BYGOCh. 17.6 - Prob. 27BYGOCh. 17.6 - Paracrine and autocrine secretions, examples, and...Ch. 17.6 - The general structure and metabolic precursor of...Ch. 17.6 - Prob. 3AYLOCh. 17.6 - Prob. 4AYLOCh. 17.6 - Prob. 5AYLOCh. 17.7 - Prob. 28BYGOCh. 17.7 - Prob. 29BYGOCh. 17.7 - Prob. 30BYGOCh. 17.7 - Prob. 1AYLOCh. 17.7 - Myxedema, endemic goiter, and toxic goiterCh. 17.7 - Effects of hypo- and hyperparathyroidismCh. 17.7 - Cushing syndrome and adrenogenital syndromeCh. 17.7 - Prob. 5AYLOCh. 17.7 - Prob. 6AYLOCh. 17.7 - Prob. 7AYLOCh. 17.7 - Consequences of inadequately treated DM and why...Ch. 17 - CRH secretion would not raise the blood...Ch. 17 - Prob. 2TYRCh. 17 - Prob. 3TYRCh. 17 - Prob. 4TYRCh. 17 - Prob. 5TYRCh. 17 - Prob. 6TYRCh. 17 - Prob. 7TYRCh. 17 - Prob. 8TYRCh. 17 - Prob. 9TYRCh. 17 - Prostaglandins are derived from a. phospholipase....Ch. 17 - Prob. 11TYRCh. 17 - Prob. 12TYRCh. 17 - Growth hormone hypersecretion in adulthood causes...Ch. 17 - Prob. 14TYRCh. 17 - Prob. 15TYRCh. 17 - Prob. 16TYRCh. 17 - Target cells can reduce pituitary secretion by a...Ch. 17 - Prob. 18TYRCh. 17 - Prob. 19TYRCh. 17 - ______ is a process in which a cell increases its...Ch. 17 - adeno-Ch. 17 - Prob. 2BYMVCh. 17 - Prob. 3BYMVCh. 17 - Prob. 4BYMVCh. 17 - Prob. 5BYMVCh. 17 - Prob. 6BYMVCh. 17 - Prob. 7BYMVCh. 17 - Prob. 8BYMVCh. 17 - Prob. 9BYMVCh. 17 - Prob. 10BYMVCh. 17 - Castration would lower a mans blood gonadotropin...Ch. 17 - Prob. 2WWTSCh. 17 - Prob. 3WWTSCh. 17 - Prob. 4WWTSCh. 17 - Prob. 5WWTSCh. 17 - The great majority of cases of diabetes mellitus...Ch. 17 - Prob. 7WWTSCh. 17 - A deficiency of dietary iodine would lead to...Ch. 17 - Prob. 9WWTSCh. 17 - Prob. 10WWTSCh. 17 - Prob. 1TYCCh. 17 - Suppose you were browsing in a health-food store...Ch. 17 - Prob. 3TYCCh. 17 - Prob. 4TYCCh. 17 - A young man is involved in a motorcycle accident...
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