During rest the breathing occurs rhythmically at the frequency of _________ times per minute in human?
Correct answer: B. 15-20
- A. 16-30
- B. 15-20
- C. 5?10
- D. 6?12
Explanation
A resting human normally breathes about 15 to 20 times per minute, with the rhythm controlled by respiratory centres in the brain in response to blood carbon dioxide levels. Students may choose 6 to 12 breaths per minute because that range can occur during unusually slow breathing, but it is below the usual resting range given here.
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