How the heart works
The heart is part of your body’s circulatory system. It’s made up of the atria, ventricles, valves, and various arteries and veins. The main function of your heart is to keep blood that’s full of oxygen circulating throughout your body. Because your heart is crucial to your survival, it’s important to keep it healthy with a well-balanced diet and exercise, and avoid things that can damage it, like smoking.
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Anxiety Disorder : <em>a condition in which real or imagined fears are difficult to control</em>
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Antigens are the substances .
It is determined by the presence of absence of antigens A and B on the surfaces of RBCs .
