Biology · Human Physiology
A runner begins intense exercise. His heart rate and force of contraction increase sharply. Which factor is primarily responsible for this increase?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Blockage of nodal tissue
- 2Decrease in secretion of adrenal medullary hormones
- 3Increased sympathetic stimulation✓
- 4Increased parasympathetic stimulation
Correct answer
Increased sympathetic stimulation
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