The Human Pump
Your heart is about the size of your closed hand,and it weighs only about 280 grams. But it is very strong. It is engine of the human body. The heart beats over 100,000 beats a day. It never stops pumping blood through your body.
The heart brings fresh blood to the rest of body. The blood contains the food and oxygen that the body needs. The heart also recycles blood and cleans it of waste before it sends it on its journey through the body.
You have about 9.5 liters of blood in your body. Your heart pumps about 20,000 liters of blood a day, all your life. The blood travels through tubes called vessels. The total length of blood vessels in the body is 96,000 kilometers.
so, in order to have a healthy heart, observe the following rules: