HMS, BM EQ-Bank 60 MC

During high-intensity exercise, what best explains why an athlete's breathing rate increases?

To increase tidal volume in the pulmonary arteries
To decrease carbon dioxide levels in the alveoli
To meet increased oxygen demands of working muscles
To reduce blood flow through the pulmonary circuit

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\(C\)

Show Worked Solution

C is correct. Breathing rate increases primarily to meet the increased oxygen demands of working muscles during intense exercise.

Other Options:

A is incorrect: Tidal volume refers to air volume, not blood in pulmonary arteries.
B is incorrect: While CO₂ removal increases, this is a result not the primary reason.
D is incorrect: Blood flow through pulmonary circuit actually increases during exercise.