Unit 3 Review

The human body is an​ (a)   system.

• open
• closed

Living things are made of _____.

What are some of the things that our cells need to operate?

• oxygen

• carbon dioxide

• fuel

• water

• building materials

A structure, such as the heart, inside the body that has a specific function.

• organ

• molecule

• food particle

• system

What is the main function of the digestive system?

• To regulate body temperature

• To protect against infections

• To pump blood throughout the body

• To break down food and absorb nutrients

Which is an example of chemical digestion.

• Food is chewed into smaller pieces.

• Amylase in saliva breaks down starch into sugar.

• The stomach churns up food.

• Food is squeezed through the esophagus by peristalsis.

Place the correct label on each group of food molecules.

a

b

c

carbohydrates

proteins

lipids

Nutrients that provide your body with the building materials needed to make and repair cells are:  

• carbohydrate

• protein

• lipid (fat/oil)

The nutrients that are our main source of energy are:

• carbohydrate

• protein

• lipid (fat/oil)

An example of a simple carbohydrate (or sugar) is:

• starch

• glucose

• fiber