Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Most water that enters the digestive tract is absorbed across the lining of the _______.

  1. a. stomach
  2. b. small intestine
  3. c. large intestine
  4. d. esophagus

Summary Introduction

Introduction: The small intestine is the major organ in human body that is involved in the absorption of major nutrients, minerals, and water. The digested food from the stomach passes through the small intestine, and the cells present in the small intestinal wall absorb the nutrients and transport them to the blood vessels.


Reason for the correct answer:

The surface areas of the intestinal walls are increased by finger-like tissue called the villi (even smaller-microvilli) that is present all over the internal walls of the small intestine. Water is absorbed to the cells present in the intestine through osmosis.

Option b. is given as “small intestine”. Water molecules that enter the digestive tract or gastrointestinal tract get absorbed into the cells lining the walls of the small intestine

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “stomach”. The stomach is main part of the body where the partial digestion of food takes place. The enzymatic and acidic activity of the stomach break down the food. This is incorrect because the stomach is only involved for digesting the food material where the absorption process is not carried out...

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