The role of the heart is to pump blood (full of oxygen and nutrients) to all parts of the body (organs, muscles, bone and skin), via a network of arteries (carry blood to the body) and veins (carry blood back to the heart).
The normal human heart is about the size of a fist and weighs 250-350 grams, depending on sex and body size. It sits behind the breastbone (sternum) and slightly to the left.
The heart consists of four chambers; the upper two are the atria (receive blood) and the bottom two are the ventricles (eject blood)
The coronary arteries are:
Left main coronary artery – this branches into the:
Right coronary artery (RCA)
Each of the main vessels has several smaller side branches
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