[Campbell Biology P.981] The text advises athletes to 'cool down' with moderate activity aft... | Practice Question

The text advises athletes to 'cool down' with moderate activity after vigorous exercise. What is the primary physiological reason for this recommendation?

  • A: To prevent lactic acid buildup in muscles.
  • B: To reduce the risk of stressing the heart excessively due to inadequate blood return if activity ceases abruptly.
  • C: To increase blood flow to the digestive system for nutrient absorption.
  • D: To rapidly lower body temperature to prevent overheating.

Explanation

The text explicitly states: 'To reduce the risk of stressing the heart excessively, athletes are encouraged to follow hard exercise with moderate activity, such as walking, to "cool down" until their heart rate approaches its resting level. If the leg muscles suddenly cease contracting and relaxing, less blood returns to the heart...this inadequate blood flow may cause the heart to malfunction.' This highlights the critical role of continued muscle activity in venous return.