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A Visual Analogy Guide to Human Anatomy 4th Edition

A Visual Analogy Guide to Human Anatomy (4th Edition)

Book Edition4th Edition
Author(s)Krieger
ISBN9781617316241
PublisherMorton Publishing
SubjectBiology
Overview: General Structures
Figure Questions
Gross Anatomy to Lobules
Figure Questions
Diving Into Bile Ducts
Figure Questions

Chapter 15, Overview: General Structures, Figure Questions, Exercise 01

Page 271

Explanation

The primary functions of the digestive system are mechanical processing, digesting, and absorbing the nutrients, as well as secreting water, enzymes, acids, salt, and buffer. It also eliminates waste products from the body.

The oral cavity is involved in the processing of food with the help of the teeth and saliva. The digestion of carbohydrates starts here with the help of salivary amylase.

The processed food in the form of a bolus travels down the esophagus and reaches the stomach, which secretes acids and enzymes that digest complex biomolecules into simpler ones. The churning action of the stomach enhances the chemical digestion.

In the stomach, the bolus is converted into acidic chyme and is passed into the duodenum of the small intestine via the pyloric sphincter. The digestive juice and bile secreted by the pancreas and liver, respectively, are drained into the duodenum for the chemical digestion of food. 

The other two sections of the small intestine are the jejunum and ileum, whose function is the absorption of water and the residual nutrients such as fatty acids, amino acids, and sugar. 

The large intestine is mainly involved in the absorption of water, vitamins, and electrolytes, as well as in solidifying and storing the feces.

The salivary glands, tongue, liver, pancreas, and gallbladder are the accessory organs of the digestive system

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