How long can a person survive without air?

• Two days

• Two hours

• Two weeks

• Two minutes

What is the primary function of the respiratory system?

• To transport oxygen and remove carbon dioxide

• To produce energy

• To circulate blood

• To digest food

What is the main muscle involved in breathing?

• Heart

• Liver

• Stomach

• Diaphragm

How does the diaphragm help in breathing?

• By filtering air

• By expanding and contracting the chest

• By pumping blood

• By digesting food

Where does air travel after passing through the trachea?

• To the liver

• To the bronchi

• To the heart

• To the stomach

What are the small tubes that the bronchi divide into called?

• Bronchioles

• Alveoli

• Capillaries

• Veins

Where does the exchange of gases occur in the lungs?

• In the trachea

• In the bronchi

• In the alveoli

• In the diaphragm

What gas is naturally produced by our body and needs to be expelled?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon dioxide

What are the tiny blood vessels that wrap around the alveoli called?

• Bronchioles

• Capillaries

• Veins

• Arteries

What helps to capture and remove particles from the air we breathe?

• White blood cells

• Alveoli

• Cilia and mucus

• Red blood cells