Respiratory System

What is the main role of the respiratory system?

• To digest food

• To circulate blood

• To exchange gases

• To produce energy

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What happens when the diaphragm contracts?

• The lungs deflate

• The chest cavity expands

• The chest cavity shrinks

• The heart beats faster

What is the function of the cilia in the nasal passages?

• To produce sound

• To filter out dust

• To absorb oxygen

• To cool the air

Where does the air go after passing through the trachea?

• Into the stomach

• Into the bronchi

• Into the heart

• Into the liver

What happens to carbon dioxide in the blood during exhalation?

• It diffuses into the alveoli

• It is absorbed by the body

• It remains in the blood

• It is converted to oxygen