Human Respiration

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What happens to the air we breathe in through our nose?

• It goes directly to the lungs.

• It is filtered by tiny hairs in the nostrils.

• It mixes with carbon dioxide immediately.

• It is warmed by the heart.

What is the function of the trachea in the respiratory system?

• It pumps blood to the lungs.

• It filters the inhaled air.

• It exchanges oxygen and carbon dioxide.

• It helps in digestion.

What are cilia and mucus, and what is their role in the bronchi?

• Cilia are muscles that help the lungs expand, and mucus is a lubricant.

• Cilia are tiny hairs that move back and forth, and mucus is a sticky substance that collects germs and particles.

• Cilia are blood vessels, and mucus transports oxygen.

• Cilia are air sacs, and mucus helps in gas exchange.

Which part of the lungs is responsible for the exchange of oxygen and carbon dioxide?

• Bronchi

• Trachea

• Alveoli

• Diaphragm

What is the diaphragm, and how many times does a person breathe approximately in one day?

• A bone that protects the lungs; 10,000 times.

• A dome-shaped muscle that aids breathing; 20,000 times.

• A type of lung tissue; 5,000 times.

• A blood vessel; 15,000 times.