At the end of inspiration,how much of the air in the alveoli is fresh air?
A)about 3%
B)about 5%
C)about 8%
D)about 10%
E)about 13%

Question

At the end of inspiration,how much of the air in the alveoli is fresh air?​
A)​about 3%
B)about 5%
C)about 8%
D)about 10%
E)​about 13%

Quizplus · Accepted Answer

At the end of inspiration, approximately 13% of the air in the alveoli is fresh air. This is because the alveolar volume is much larger than the tidal volume, and only a portion of the inspired air reaches the alveoli, mixing with the residual air already present.

At the End of Inspiration,how Much of the Air in the Alveoli