Unit 1 Lesson 3 Obtaining Energy and Remonving Waste

What is the function of peristalsis?

• to move food through the digestive system

• 
  to remove excess liquid from the body

• to chemically digest food to release nutrients

• 
  to absorb nutrients into the blood

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 _____.

• 
  esophagus

• mouth

• 
  intestine

• 
  liver

Digestion begins in the mouth with chewing and _____ beginning to break down food.

The function of the excretory system is to collect and eliminate wastes from the body and regulates the level of fluid in the body.

• True
• False

Reorder the following with the correct order of the digestion process.

• undigested food is eliminated

• food is ingested through mouth

• food is digested

• nutrients and water in the food are absorbed

It is not necessary to have both mechanical and chemical digestion.

• True
• False

Chewing is _____ digestion.

• chemical

• mechanical

Absorption in the small intestines occurs through the walls of fingerlike projections called _____.

• glands

• enzyme

• villi

• digestion

The nutrients in food enter and are used by the body. This happens through the processes of digestion.

• True
• False