We need about 1 L of oxygen per minute to maintain our resting metabolism and ab

Question

We need about 1 L of oxygen per minute to maintain our resting metabolism and about 2.2 L when standing and walking. Let the air intake per breath be 0.40L.

Part A

Estimate the number of breaths per minute for a person to satisfy this need when resting. Remember that oxygen is about 21% of the air. Express your answer using two significant figures.

Part B

Estimate the number of breaths per minute for a person to satisfy this need when standing and walking. Express your answer using two significant figures.

Explanation / Answer

Here ,

part A)when we are siting

number of breaths needed = oxygen needed/oxygen per breath

number of breaths needed = 1/(0.40 * 0.21)

number of breaths needed = 11.9 = 12

the number of breaths needed is 12 per minute

part B)

when the person is standing

number of breaths needed = oxygen needed/oxygen per breath

number of breaths needed = 2.2/(0.40 * 0.21)

number of breaths needed = 26.2 = 26

the number of breaths needed is 26 per minute

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