Ch 2.1 - The Pathways of air & Gaseous exchange

What is the function of the respiratory system?

• To regulate body temperature

• To digest food

• To take in oxygen and expel carbon dioxide

• To pump blood throughout the body

What is the role of the bronchioles in the respiratory system?

• To maximize contact between air and blood

• To protect the airway

• To exchange gases with the bloodstream

• To distribute air throughout the lungs

Where does gaseous exchange take place in the respiratory system?

• Mouth

• Trachea

• Bronchi

• Alveoli

What is the total surface area of the alveoli similar to?

• A football field

• A tennis court

• A swimming pool

• A basketball court

What is the purpose of the moist lining of the alveoli?

• To speed up the rate of oxygen uptake and carbon dioxide removal

• To prevent gas exchange

• To block the diffusion of gases

• To reduce the surface area for gas exchange

What surrounds each air sac in the alveoli?

• Bones

• Capillaries

• Muscles

• Nerves

How does the excellent blood supply in the alveoli contribute to gaseous exchange?

• It obstructs the diffusion of gases

• It minimizes diffusion distance for efficient gaseous exchange

• It reduces the number of capillaries

• It slows down the rate of oxygen uptake

What does it mean for the alveoli to be well ventilated?

• They restrict the flow of oxygen

• They trap carbon dioxide

• They collapse and block the airway

• They expand and fill with air during inhalation

What is the primary role of the trachea in the respiratory system?

• To draw air into the lungs

• To maximize contact between air and blood

• To protect the airway

• To distribute air throughout the lungs

What is the first structure through which air passes as we inhale?

• Bronchi

• Trachea

• Mouth and nasal passage

• Alveoli