what is mean by heart and how it works
Answers
Answer:
heart is on f the organ. that pumps tha bood into tha whole body
Answer:
Our heart is the pump which powers your body. It supplies blood carrying oxygen and nutrients to every cell, nerve, muscle and vital organ in your body.
It sits in your chest between your lungs, slightly to the left of centre, and is protected by your rib cage.
Our heart is about the size of your clenched fist and weighs about 300 grams (that's just over half a packet of butter).
The walls of your heart are made of powerful muscle tissue, which squeezes and relaxes to pump blood around your body. This muscle tissue is divided into three layers.
The endocardium (the inside layer).
The myocardium (the muscular middle layer).
The epicardium (the protective outer layer).
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