CanFitPro Personal Training Specialist Practice Test

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What immediate responses does the cardiorespiratory system exhibit at the onset of exercise?

  1. Decrease in HR

  2. Increase HR and stroke volume

  3. Decrease in cardiac output

  4. Increase in blood pressure

The correct answer is: Increase HR and stroke volume

During exercise, the body's demand for oxygen and nutrients increases. The cardiorespiratory system responds by increasing both heart rate (HR) and stroke volume. This allows the body to pump more blood and oxygen to the working muscles. Additionally, the sympathetic nervous system releases adrenaline, which causes an overall increase in blood pressure to ensure that enough oxygen is delivered to the working muscles. Options A, C, and D are all incorrect because they describe responses that are opposite to what actually occurs during the onset of exercise. There is no decrease in HR, cardiac output, or blood pressure at the onset of exercise.

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