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5 March, 23:59

The increase in heart rate at the very beginning of exercise is due to

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Answers (2)
  1. 6 March, 01:34
    0
    a greater volume of blood returning to the heart

    Explanation:

    Your heart rate goes up when your heart starts pumping faster.
  2. 6 March, 02:19
    0
    A greater volume of blood returning to the heart.
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