Breathing and Gas Exchange Quiz

What happens to the diaphragm muscles during inhalation?

• They contract and flatten.

• They relax and become dome-shaped.

• They contract and become dome-shaped.

• They relax and flatten.

During exhalation, what happens to the pressure inside the lungs compared to outside the body?

• It becomes lower than outside the body.

• It becomes higher than outside the body.

• It remains the same as outside the body.

• It fluctuates rapidly.

Which gas has a higher percentage in exhaled air compared to atmospheric air?

• Nitrogen

• Oxygen

• Carbon dioxide

• Argon

What is the approximate percentage of oxygen in atmospheric air?

• 16%

• 21%

• 78%

• 79%

Carbon dioxide gas has the chemical formula

• CO

• CO₂

• CO₃

• CO₄

The yellow structures on the right side of this picture represent ________.

• diaphragm

• pharynx

• alveoli

• trachea

__________ are air sacs where gas exchange takes place.

• Bronchi

• Trachea

• Oxygen

• Alveoli

Gas exchange is needed to supply _____________ to cells and remove __________________ from cells.

• carbon dioxide; oxygen

• oxygen; food

• oxygen; carbon dioxide

• carbon dioxide; water

The two tubes that the trachea splits into (letter E) are known as the ______.

• pharynx

• bronchi

• trachea

• alveoli

Letter D in this diagram is

• pharynx

• bronchiole

• trachea

• alveoli