U.C.E BIOLOGY 2000 PAPER 1 QN 15

The data below shows the amount of carbon dioxide in inhaled air, rate of breathing at rest and volume of air in a breath, in humans:

Percentage of carbon dioxide in inhaled air = 0.025%.

Number of breaths per minute = 36.

Volume of one breath taken in at rest = 500 cm3.

The volume of carbon dioxide inhaled per minute while at rest is

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