Gas exchange at the respiratory membrane is efficient because

A. the difference in partial pressures is substantial.
B. the distances involved in exchange are small.
C. the total surface area of the membrane is large.
D. blood flow and air flow are coordinated (blood flow is highest around alveoli with highest Po2).
E. All of these are correct.


Ans: E. All of these are correct.

Anatomy & Physiology

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