Period 1 test 3b Obtaining Energy and Removing Waste

What is the function of peristalsis?

• to absorb nutrients into the blood

• to remove excess liquid from the body

• to move food through the digestive system

• to chemically digest food to release nutrients

When does the first step of digestion usually occur?

• when the organism discovers the food

• when the food is chewed

• when the food is swallowed

• when the nutrients are absorbed

Food enters the human body through the _____.

• Liver

• mouth.

• esophagus

• intestine

Digestion begins in the mouth with chewing and (a)   beginning to break down food.

Choose the answer which lists the correct order of the digestion process.

• C, D, A, B

• C, A, D, B

• A, C, D, B

• A, B, C, D

Chewing is what kind of digestion?

Why is it necessary to have both mechanical and chemical digestion?

Absorption in the small intestines occurs through the walls of fingerlike projections called (a)   .