Components+of+the+circulatory+system

Every time you breathe in old blood that has been used to go around giving the body oxygen, It needs to become fresh again so we breath in giving the body the oxygen that it needs. When you breathe in you give old blood oxygen So it becomes fresh again. The blood goes down In to the left atrium which is in the heart then It get pumped down in to the left ventricle and Then it gets pumped out of the heart and goes to Rest of the body that needs oxygen and then it Becomes old In the circulatory system the components include the heart, blood, arteries and veins
 * Red blood cells**
 * Red blood cells are tiny if you laid them down end t end**
 * They would only make a line of 1mm long. They are doughnut shaped, round with a dip in the middle the shape allows them to squeeze through small blood vessels without bursting. Unlike most other cells, they do not have a nucleus. They are just thin bags filled with liquid.**
 * The components of the circulatory system**
 * How the heart beats**
 * When the heart squeezes and pushes the blood out that is called systole (siss-teo-lee) with great force muscle contraction make the blood surge into the arteries. The pressure travels as a bulge or pulsation in the artery wall, out through all the arteries around the body.**


 * The heart is not really shaped like a heart shape. It is more like an upside down pear, with large blood vessels at the top**


 * Pericardium**
 * (Outer layer) is a sac that encloses the hearts body. Its inner face is called the Epicardium.**


 * The left and right coronary arteries supply the heart with blood. Both arteries branch directly from the aporta. And ensure that all parts of the myocardium**
 * Are adequately supplied with oxygenated blood

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