Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 45)
What factors increase the efficiency of gas exchange in the lungs? (Select all that apply)
A large surface area of the alveoli
A thick barrier for gases to diffuse through
A rich blood supply in the capillaries surrounding the alveoli
A steep concentration gradient between the air in the alveoli and the blood in the capillaries
Explanation
A large surface area, a rich blood supply, and a steep concentration gradient all facilitate efficient gas exchange.
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