By:Shyheem Nobles-Strong, Cleveland Grace,De’Erik Farmer,Elijah Privott

1. The heart has two sides, the left and the right side It takes 20 seconds for blood to circulate the entire body 3. The average adult heart beats 72 times a minute; 100,000 times a day; 3,600,000 times a year; and 2.5 billion times during a lifetime. 4. The “thump-thump” of a heartbeat is the sound made by the four valves of the heart closing. 5. The heart begins beating at four weeks after conception and does not stop until death

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When you breath in air through your mouth and nose it travels to your lungs.Oxygen from the air is absorbed into your bloodstream through your lungs.Your heart then pumps oxygen-rich (oxygenated) blood through a network of blood vessels (arteries) to tissues including your organs,muscels and nerves,all around your body And the cardiovascular system is a key element.