The most obvious body response to strenuous exercise is an increase in the rate of heartbeat.
1. During strenuous exercise, the body requires more oxygen and nutrients to meet the increased demand from the muscles.
2. To deliver these essential elements efficiently, the heart rate increases to pump more blood throughout the body at a faster rate.
3. This increased heart rate helps to transport oxygen and nutrients to the muscles while removing waste products like carbon dioxide efficiently.
4. The body's response of increasing the heart rate during exercise is crucial for maintaining optimal performance and meeting the energy demands of the muscles.
In summary, the correct answer is C. heartbeat. This response showcases the body's adaptive mechanism to support the increased metabolic needs during strenuous physical activity.
