The student stopped to rest in response to the body's internal stimulus of a increased heart rate. That is option D.
What is heart rate?
The heart rate is defined as the number of times the heart beats per minute. Depending on the state of the body it can increase or decrease per minute time
During exercise, the heart rate increases during exercise because the body need more oxygen which can be gotten by increased cardiac output.
Therefore, The student stopped to rest in response to the body's internal stimulus of a increased heart rate.
Learn more about heart rate here:
https://brainly.com/question/26387166
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