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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

A specialized region of the digestive tract is/are the:

a. submucosa formed by circular and longitudinal layers.

b. serosa lining the digestive tract for absorption.

c. mucosa composed of thick, elastic connective tissue for movement.

d. muscularis, an outer layer that secretes a slippery material to prevent friction with other organs.

e. sphincters, which form valves between major digestive organs.

Summary Introduction

Introduction:

Most invertebrates and all vertebrates show extracellular digestive system consisting of a digestive tract along with the digestive organs. The digestive tract is a specialized tube in which the digestive contents move in one direction from the mouth to the anus.

Explanation

The justification for the correct answer:

Option (e) says that sphincters are the specialized region of the digestive tract that forms valves between major digestive organs. This is a true statement. The digestive tract is a specialized tube that contains four major layers; mucosa, submucosa, muscularis, and serosa, sphincters are a powerful muscle that forms valves between these major parts of the digestive tract. Hence, option (e) is correct.

The justification for the incorrect answers:

Option (a) states that the submucosa is formed by circular and longitudinal layers. This is an incorrect statement as the correct statement is that the submucosa layer is formed of a thick layer of connective tissues that are composed of a network of neurons and blood and lymph vessels and not circular and longitudinal layers. So, is an incorrect option.

Option (b) says that the serosa lines the digestive tract for absorption...

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