A man runs up a fl ight of stairs. His respiratory rate rose from 18 breaths per minute (resting) to 36 bpm (at the top of stairs). The increase was probably a result of: A. increased blood pH B. increased concentration of CO 2 in the blood C. decreased concentration of O 2 in the blood D. decreased concentration of CO 2 in the blood

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Muskan Anand

2 years ago

Option B. Muscular activity might have incresed the rate of oxygen con- sumption and carbon dioxide manufacturing with the aid of using cells. A better respiratory rate is required to take withinside the needed oxygen and to excrete the produced carbon diox- ide. It is increased CO 2 as opposed to reduced O 2 that stimulates breathing fee.

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