Can anyone explain this in more engineering terms? Biology can be difficult for me to read and to understand.
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There are few different ways to look at this.
In your chest the expansion and contraction of you heart opens and closes valves between chambers and blood vessels to pass blood through.
Your heart is a pump, when your heart contracts it pushes blood into your arteries through your body. This can be felt as a pulse in may spots including you neck (carotid), wrist (radial), bicep (brachial), groin (femoral), feet (pedal). Once the chamber it must expand to refill with blood.
You heart also creates an electrical pulse, which can be measured by an EKG, which is what causes the heart to expand and contract.
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