Alveoli and Gas Exchange

Tiny air sacs in the lungs where gas exchange takes place. Oxygen in / carbon dioxide out.

• bronchi

• alveoli

• bronchioles

• lymph nodes

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

• air/oxygen

• oxygen/carbon dioxide

• carbon dioxide/waste

• waste/air

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 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

During gas exchange what enters from alveoli to the capillaries?

• CO₂

• CO

• O₂

• nitrogen

The movement by diffusion of oxygen and carbon dioxide across a membrane

• Ventilation
• Breathing
• Gas exchange
• Respiration

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body

• to bring oxygen to the body

• to break down food and absorb nutrients

• to remove oxygen from the body and deliver carbon dioxide

Letter D is pointing to which Respiratory organ?

• Alveoli
• Diaphragm
• Lung
• Bronchi