Wonderful pump: Our heart is a pump that keeps pumping from before we're born until we die (and even beyond the heart owner's death in some cases). Suppose you take a deep breath. That creates a vacuum inside the chest, leading to less flow of blood into the heart, leading to a smaller quantity of blood leaving the heart per pump stroke. Increasing the rate compensates for less blood per pump stroke.
Answered 2/28/2020
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