The circulatory system consists of the heart and blood vessels including arteries, veins and capillaries. The heart propels the circulation of the blood serving as the transportation system to transfer oxygen, fuel, nutrients, waste products, immune cells and hormones from one part of the body to another.
The blood consists of fluid that carries cells in the circulation, including some that move from tissue to blood vessels and back, as well as the spleen and bone marrow. The circulatory system includes cardiology (heart), hematology (blood) and cardiovascular physiology in its purview. A well-functioning circulatory system is crucial for vitality and optimal health.
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