Whereas we can exist without the spleen, an arm or a leg, and even the kidneys (provided dialysis is available now and then), we cannot live for even a few seconds without a functioning circulatory system.
The functions of the circulation are numerous and varied. The major functions deal with delivery of nutrients and the removal of waste products. Included here are not only food stuffs such as carbohydrates, amino acids, urea, etc., but also gases such as oxygen and carbon dioxide.
Hormones, other regulatory substances, antibodies, phagocytes, etc. are transported about in the body through the circulation. Osmotic balance is carried out by every individual cell, but the kidneys fulfill this function on a body-wide basis.
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