Gas Exchange

When you breathe, your lungs take in ___ and remove ___.

• air/oxygen

• oxygen/carbon dioxide

• carbon dioxide/waste

• waste/air

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi

• lungs

• oxygen

• alveoli

What is the site of gas exchange?

• alveoli

• bronchus

• nose

• trachea

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

What is the name of two main branches from the trachea (one to each lung)?

• bronchi

• alveoli

• capillaries

• bronchioles

Given the following structures:

1. alveoli

2. bronchi

3. bronchioles

Which of the following is the correct order in which air would flow after inhalation?

• 1,2,3

• 2,1,3

• 2,3,1

• 3,2,1

What adaptations does the alveoli have for efficient gas exchange?

• thick walls

• thin walls

• small surface area

what is found around alveoli?

• capillaries

• pleura

• lymphatic nodes

• saliva

Diaphragm is

• part of lungs

• muscle that helps in breathing

• throat muscle

• structure in bones

During gas exchange what enters from alveoli to the capillaries?

• CO₂

• CO

• O₂

• nitrogen