Gas Exchange and Transportation Quiz

What do terrestrial organisms exchange gases with?

• Water

• Soil

• Air

• Rocks

Gas exchange is the result of which of these processes?

• Combustion

• Diffusion

• Evaporation

• Condensation

What allows gas exchange to occur on the outer surface of unicellular organisms?

• Large surface area-to-volume ratio

• Small surface area-to-volume ratio

• Thick cell walls

• High temperature

What is the function of moisture on gas-exchange surfaces in terrestrial organisms?

• To dry the surface

• To dissolve gases

• To harden the surface

• To block gas exchange

What happens if there are no concentration gradients in gas exchange?

• Diffusion occurs rapidly

• Diffusion does not occur

• Diffusion occurs slowly

• Diffusion is enhanced

What is the primary reason gradients must be maintained for gas exchange?

• To allow gases to continue to diffuse

• To prevent cellular respiration

• To increase oxygen concentration outside the cell

• To decrease CO2 production

What is the primary function of ventilation in gas exchange?

• To maintain concentration gradients

• To increase CO2 production

• To decrease oxygen consumption

• To prevent blood flow

Why are the walls of alveoli very thin?

• To allow gases to diffuse over a short distance

• To increase blood flow

• To prevent gas exchange

• To support the lungs

What is the role of the surfactant in the inner surface of alveoli

• They promote the collapse of alveoli

• They promote sticking of the alveoli walls

• They prevent alveoli from sticking during inhalation.

• They prevent alveoli from collapsing

Which of the following is a correct statement about lung volumes?

• Residual volume is the air inhaled during normal breathing

• Vital capacity is the air left after maximum exhalation

• Total lung capacity is the total volume of air in the lungs after maximum inhalation

• Tidal volume is the maximum air forcefully inhaled