When someone is running, the heart rate will be faster since there will be an increase in frequency of the heart’s contraction cycle (a.k.a cardiac cycle).

While running, the heart, our body’s muscular pump, will be pumping faster and hence the heart rate will be slower.

The type of muscle involved in the modulation of blood vessels diameter (shown in (c)), is (2) in inset (b). When someone exercises, vasodilation happens for thermoregulation.

When someone is running, the calf muscles in the legs are likely to belong to motor unit 2.

When someone is running, the calf muscles in the legs are likely belonging to motor unit 1.

The type of muscle involved in the modulation of blood vessels diameter (shown in (c)), is (2) in inset (b). When someone is running vasoconstriction happens for thermoregulation.