Human Gas Exchange

What gas is in 21% of inspired air?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Water Vapour

How many percentage of carbon dioxide is in expired air?

• 78%

• 21%

• 16%

• 4.5%

What is organ Y?

• Bronchi

• Bronchioles

• Trachea

• Alveoli

What is organ Z?

• Bronchi

• Bronchioles

• Trachea

• Alveoli

What is organ W?

• Bronchi

• Bronchioles

• Trachea

• Alveoli

The diagram shows the structure of the human gas exchange system. Name organ P.

• alveolus

• trachea

• bronchus

• diaphragm

The diagram shows the structure of the human gas exchange system. Name organ Q.

• alveolus

• trachea

• bronchus

• diaphragm

Which of the following are features of the alveoli that adapt them to gas exchange?

I. High surface area
II. Thin walls
III. Dry surfaces

• I and II only

• I only

• II and III

• I, II, and III

In humans, the thin, moist membranes of the alveoli are surrounded by

• bronchi

• the epiglottis

• capillaries

• lymph vessels

What adaptations does the alveoli have for efficient gas exchange?

• thick walls

• thin walls

• small surface area