The sinoatrial (SA) node is a collection of cells in the heart that influence how the organ functions. These cells provide impulses that are continuously transmitted to the heart, prompting it to beat in a regular manner.
When the heart beats, it pumps blood from its chambers into the blood arteries. This creates pressure, which causes blood to flow throughout your body. The heart beats 100,000 times every day, pushing approximately 2,000 gallons of blood.
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