Biology: Concepts and Applications (MindTap Course List)
Biology: Concepts and Applications (MindTap Course List)
9th Edition
ISBN: 9781285427812
Author: Cecie Starr, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 36, Problem 1SQ
Summary Introduction

Introduction:

The process of digestion refers to the catabolism of the food. There are various enzymes and secretions produced by the GI tract that helps in the solubilization of the food material and helps in the absorption by the body.

Expert Solution & Answer
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Answer to Problem 1SQ

Correct answer:

A digestive system functions in absorbing compounds, eliminating wastes, and secreting enzymes. Hence, the correct answer is option d.

Explanation of Solution

Reason for correct answer:

Option d. is given as “all of the above.”

The process of digestion starts with the process of enzymes secretion. It helps in the solubilization of food. The absorption of the nutrients takes place in the intestine. The intestine is composed of finger-like projections that are referred to as villi. Each of these villi consists of a capillary network in which food gets absorbed. After the absorption process, it goes to the liver for the elimination of wastes.

Reason for incorrect answer:

Option a. is given as, “secreting enzymes.”

This process only secretes enzymes to the food for its digestion, also there are other processes involved in the process of digestion. Hence, option a. is incorrect.

Option b. is given as, “absorbing compounds.”

This process cannot take place before the secretion of enzymes for digesting food. There are other processes involved in the process of digestion. Hence, option b. is incorrect.

Option c. is given as, “eliminating wastes.”

The process of waste elimination occurs after the process of enzyme secretion and food absorption. Hence, option c. is incorrect.

Hence, the options a, b, and c are incorrect.

Conclusion

A digestive system functions in eliminating wastes, absorbing compounds, and secreting enzymes. Thus, the correct option is d.

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Human digestive system - How it works! (Animation); Author: Thomas Schwenke;https://www.youtube.com/watch?v=X3TAROotFfM;License: Standard Youtube License