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

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

• Ventilation
• Breathing
• Gas exchange
• Respiration

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

The trachea leads to the...

• Bronchioles
• Bronchi
• Esophagus
• Pulmonary Vessel

What increases during exercise?

• Breathing rate

• Heart rate

• Depth of breathing

• Blood pressure

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

• carbon dioxide; oxygen

• oxygen; food

• oxygen; carbon dioxide

• carbon dioxide; water

Function of cilia:

• Traps dust

• Moves mucus

• Traps bacteria

Respiration is the 

• Intake of oxygen and release of carbon dioxide over a membrane
• Release of energy from food inside cells
• Mechanical movement to inhale and exhale air
• Feature that enable an animal to survive in its habitat

• A
• B
• C
• D

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

• Bronchi

• Trachea

• Oxygen

• Alveoli