The Respiratory System

What is the main purpose of the respiratory system?

• To pump blood

• To control movement

• To bring oxygen into the body

• To digest food

Which organ is smaller on the left side to make room for the heart?

• Liver

• Right lung

• Left lung

• Stomach

What muscle helps the lungs to breathe by tightening and flattening out?

• Heart

• Stomach

• Diaphragm

• Liver

What is the role of cilia in the respiratory system?

• To produce oxygen

• To digest food

• To filter air and remove unwanted substances

• To pump blood

What is the process called where oxygen and carbon dioxide are exchanged in the lungs?

• Inhalation

• Respiration

• Diffusion

• Exhalation