Choose the list that presents the four stages of food processing in the order in which they naturally occur.
a. ingestion → digestion → absorption → elimination
b. digestion → ingestion → absorption → elimination
c. ingestion → digestion → elimination → absorption
d. ingestion → absorption → elimination → digestion
e. absorption → digestion → ingestion → elimination

A

Explanation:

First you eat (ingestion).

Second your stomach breaks it up (digestion).

Third your body uses what it can (absorption).

Fourth your body gets rid of what it doesn't use (elimination).

Ingestion → digestion → absorption → elimination is the correct order of four stages of food processing in which they naturally occur.  

Explanation:

Food processing begins with ingestion or intake of food through the mouth.

Ingested food gets masticated by the teeth, tongue, and salivary glands. The bolus of ingested food is formed which then passes down the alimentary canal to esophagus and to digestive organs like stomach, pancreas, liver, intestines.

Digestion involves the biochemical breakdown of complex macromolecules like carbohydrates, proteins, fats into simpler sugar particles with the help of enzymes and digestive juices.

Absorption involves the assimilation of simple organic molecules or nutrients like amino acids, glucose, fatty acids etc by the intestines.

Elimination of undigested food like fiber and other waste elements is done by organs like rectum and anus.

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