The Magic School Bus: Works Out

The sacks next to the heart are the _____.

• lungs

• kidneys

• eyes

• brain

How many times does the heart pump the blood?

• once

• twice

• three times

• four times

The heart is like what type of machine?

• lever

• pump

• wedge

• pulley

Red blood cells bring ____ to the muscle cells.

• carbon dioxide

• carbon monoxide

• oxygen

_______ breathe in air.

• lungs

• bones

• nails

The ______ pumps the blood to the muscles.

• heart

• arm

• hand

• foot

What type of activity makes the heart, lungs, and muscles stronger?

• aerobic activity

• resting

• sleeping

What is the most important MUSCLE in the body?

• the heart

• quadriceps

• biceps

• triceps