Question

49. Percentage of O, present in inhaled air
in human beings is appoximately
(a) 21%
(b) 77%
(c) 0.04%
(d) 3%​

Answer 1

Answer:

20.95%

Explanation:

Inhaled air is by volume 78% nitrogen, 20.95% oxygen and small amounts of other gases including argon, carbon dioxide, neon, helium, and hydrogen. The gas exhaled is 4% to 5% by volume of carbon dioxide, about a 100 fold increase over the inhaled amount.

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20.95 means 21

Answer 2

Answer:

21 percent

this is the answer