Question
Breathing and metabolism We need about $0.7 \mathrm{L}$ of oxygen per minute to maintain our resting metabolism and about $2 \mathrm{L}$ when standing and walking. Estimate the number of breaths per minute for a person to satisfy this need when resting and when standing and walking. What assumptions did you make? Remember that oxygen is about $21 \%$ of the air.
Step 1
We know that the volume of air a grown-up human inhales in one breath is about 0.5 L and that oxygen is about 21% of the air. Therefore, the amount of oxygen in one breath is given by: \[V_1 = 0.5 \times 0.21 = 0.105 \, \text{L}\] Show more…
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BlO EST Breathing and metabolism We need about 0.7 $\mathrm{L}$ of oxygen per minute to maintain our resting metabolism and about 2 $\mathrm{L}$ when standing and walking. Estimate the number of breaths per minute for a person to satisfy this need when resting and when standing and walking. What assumptions did you make? Remember that oxygen is about 21$\%$ of the air.
The average breath takes in about $1 \frac{1}{2}$ pints of air. The air is about $20 \%$ oxygen. Of the oxygen that we breathe, about $25 \%$ makes its way into our bloodstream. How much oxygen does the average person take in every day? (See Exercise 112 .)
Measurement
The U.S. Customary System of Measurement
$\bullet$$\bullet$ How often do we need to breathe? A resting person requires 14.5 $\mathrm{L}$ of $\mathrm{O}_{2}$ per hour to maintain metabolic activities. Such a person breathes in 0.50 $\mathrm{L}$ of air at approximately $20^{\circ} \mathrm{C}$ with each breath. The inhaled air is $20.9 \% \mathrm{O}_{2},$ while the exhaled air is 16.3$\% \mathrm{O}_{2} .$ (a) How many breaths per minute does a resting person need to take to provide the necessary oxygen? (b) How many $\mathrm{O}_{2}$ molecules does a resting person inhale per breath?
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