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Question

The normal range of breathing rate per minute in an average adult at rest is:

A
9–12
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B
15–18
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C
21–24
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D
30–33
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Solution

The correct option is: B

Explanation of the correct option:

The average breathing rate in an adult is 15-18 times per minute in normal conditions.

Explanation of the incorrect option:

Option A: During exercise, the breathing rate becomes 21-24 times to supply more and more oxygen.

Option C: The average breathing rate in an adult is 15-18 times per minute in normal conditions. During exercise, the breathing rate becomes 21-24 times to supply more and more oxygen.

Option D: The average breathing rate in an adult is 15-18 times per minute in normal conditions. During exercise, the breathing rate becomes 21-24 times to supply more and more oxygen.

Final answer: The normal range of breathing rate per minute in an average adult at rest is 15–18 times


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