Which change in heart rate is commonly observed in response to increased physical activity?

During physical activity, the body's demand for oxygen increases as muscles work harder. To meet this demand, the cardiovascular system must adapt, primarily by increasing blood flow. One of the most effective ways to increase blood flow is by elevating the heart rate.

As exercise starts, the brain signals the heart to pump faster, which helps to deliver more oxygen-rich blood to the muscles. This increase in heart rate is a physiological response known as the "exercise-induced tachycardia." Typically, the heart rate can increase significantly during moderate to vigorous exercise, demonstrating the body's capacity to adapt to varying levels of activity and maintain homeostasis.

This response is crucial for sustaining higher levels of exertion and improving overall cardiovascular endurance. Considering these factors, an increase in heart rate during physical activity is the expected and necessary physiological change.