Structure and working of heart

https://docs.google.com/presentation/d/1TGfu2Y-VuzdKz7ZE3QKL29bHYpmMAOC4/edit?usp=drive_link&ouid=112418425102942225803&rtpof=true&sd=true 


The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger than the size of your fist. By the end of a long life, a person’s heart may have beat (expanded and contracted) more than 3.5 billion times. In fact, each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood.

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