Examlex
Jake wanted to improve his rock-climbing abilities so he decided to strengthen his forearms with wrist curls.Which principle of physical activity does this represent?
SA Node
The SA node, or sinoatrial node, acts as the heart's natural pacemaker, initiating the electrical impulse that triggers heart contractions and regulates heart rate.
Venous Compliance
The capacity of veins to expand in response to increased blood volume, an important factor in regulating blood pressure.
Cardiac Output
The volume of blood the heart pumps through the circulatory system in one minute, an important measure of heart function.
Subclavian Arteries
Major arteries on either side of the body that supply blood to the arms, brain, and thorax.
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