Human Biology
Human Biology
15th Edition
ISBN: 9781259689796
Author: Sylvia Mader, Michael Windelspecht
Publisher: McGraw-Hill Education
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Chapter 9, Problem 1A
Summary Introduction

Introduction:

Digestive system organs are present in a long tube called gastrointestinal tract. The digestive system hydrolyzes macro molecules which can be carbohydrates, proteins and fats present in the food into their respective sub unit molecule form and absorb these subunit molecules and eliminate the waste.

Expert Solution & Answer
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Answer to Problem 1A

Correct answer:

The ability of the digestive system to break down macromolecules into smaller subunits is hydrolysis. Therefore, option (d) is correct.

Explanation of Solution

Reason for the correct statement:

Hydrolysis is the breakdown of macromolecules into smaller subunit molecules.

Option (d) is given as “hydrolysis”.

The “ability of the digestive system to break down macromolecules into smaller subunits is called as hydrolysis”, it is the right answer.

Hence, option (d) is correct.

Reasons for the incorrect statements:

Option (a) is given as “peristalsis”.
Peristalsis is a rhythmic digestive tract movement that aids in ingestion of food. So, it is a wrong answer.

Option (b) is given as “ingestion”.
Ingestion is when food is taken by the body. So, it is a wrong answer.

Option (c) is given as “absorption”.
Absorption is the uptake of nutrients from lumen of intestinal tract. So, it is a wrong answer.

Option (e) is given as “elimination”
Elimination is the removal of waste material from the body. So, it is a wrong answer.

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

Conclusion

The ability of the digestive system to break down macromolecules into smaller subunits is called as the hydrolysis.

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