Which one of the following factors is NOT a major cause of increased ventilation at the beginning of exercise?

Question

Which one of the following factors is  NOT  a major cause of increased ventilation at the beginning of exercise?

Answer

Low blood PCO2 levels.

Answer

The psychological effects of anticipating exercise.

Answer

Excitatory signals from proprioceptors to the respiratory centers.

Answer

Simultaneous activation from the cortex of skeletal muscles and respiratory centers

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