It simply keeps it circulating throughout the body. Your heart is the one muscle that works all the time and keeps you alive. Your mind and your heart basically depend on each other. The mind tells the heart when to beat, and the heart pumps oxygen-rich blood to the mind.
But really all the heart does is allow blood circulation through your body. Best to eat healthy to avoid disturbances in its work, which are usually lethal. (Life threatening.)
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The general blood flow path is from the aorta to the heart. The blood will then leave the heart and flow throughout the rest of the body. This path of blood happens every time the heart beats.
Because they're the same. Every time the heart beats it pushes an amount of blood around the body, and that push is what you can feel in the wrists, by the throat or where you prefer to monitor the pulse.
There is around 5 litres of blood in your body at any given time and the heart pumps on average 70 ml of blood per beat. Most people have an average resting heart rate of about 70 beats a minute (approximately). So if you multiply the amount of blood that the heart can pump by the number of beats per minute, you actually get around 4.9 litres of blood, almost all of it. So, in a minute, you will pump all the blood througout your body.
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It really is lubb dupp and it is the sound of the 4 valves closing, two at a time. This occurs during one heart beat.