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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

Which of the following best describes regulation of digestion?

a. GIP inhibits insulin release from the pancreas.

b. Gastrin stimulates pancreatic secretion of HCl andpepsinogen.

c. Secretin stimulates gastric emptying into the duodenum.

d. CCK stimulates gastric activity to activate the duodenum.

e. Leptin binds different hypothalamic receptors to inhibitappetite.

Summary Introduction

Introduction:

The digestion of food through the digestive tract is controlled by receptors and hormones secreted by the digestive organs. The hormones that play a major role are; gastrin, secretin, glucose-dependent insulinotropic peptide (GIP), and cholecystokinin (CCK).

Explanation

The justification for the correct answer:

Option (e) states that leptin binds different hypothalamic receptors to inhibit appetite. This is a true statement. The fat-storing cells produce the hormone leptin, a major link in the control pathways. It travels in the bloodstream and binds to the receptors at both centers in the hypothalamus. This binding causes the stimulation of reduced appetite and inhibition of the center that stimulates appetite. Hence, option (e) is correct.

A justification for the incorrect answers:

Option (a) states that GIP inhibits insulin release from the pancreas. This is a wrong statement as GIP, the glucose-dependent insulinotropic peptide hormone, stimulates the insulin released by the pancreas, not inhibits. So, is an incorrect option.

Option (b) states that gastrin stimulates pancreatic secretion of HCl and pepsinogen...

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