6.4 Gas exchange

Question 1

Gas exchange

Answer 1

Exchange of oxygen and carbon dioxide in alveoli and bloodstream, by diffusion

Question 2

Cell respiration

Answer 2

Release of ATP from organic molecules, more effective in aerobic respiration

Question 3

Ventilation

Answer 3

• Exchange of air between the lungs and the atmosphere, by breathing
• To keep the concentration gradient within alveoli