Respiration

Through what organ does the air move from the outside to the inside?

• Nose

• Mouth

• Lungs

What nose part purifies the air when inhalation?

• Diaphragm

• Nostrils

• Larynx

• Pharynx

What are the tiny air sacs in the lungs called?

• Trachea

• Vertebrates

• Alveoli

What does the trachea divide into?

• Pharynx

• Larynx

• The trachea divides into two bronchi. The bronchi then divide into bronchioles and finally alveoli.

What allows the alveoli to be the site of gas exchange at the level of the lungs?

• They are next to the lungs

• They are rich with blood capillaries

• They are small air sacs

• They have a very thin wall.

What happens to the diaphragm when you breathe in (inhalation)?

• Raised up

• Lowered down

What happens to the diaphragm when you breath out (exhalation)?

• Lowered down

• Raised up

Vertebrates use their (.) to perform breathing and respiration:

• Skin

• Lungs

Which two structures does the trachea lead to in the lungs?

• Bronchus/bronchi; the trachea leads to two bronchi (one is called a bronchus).

• Bronchioles

• Alveoli

• Lung

What is the gas exchange that occurs between the alveoli and the blood?

• Oxygen gas diffuses from the alveoli to the blood. Carbon dioxide gas diffuses from the blood to the alveoli.

• Carbon dioxide gas diffuses from the alveoli to the blood. Oxygen gas diffuses from the blood to the alveoli.