Circulation in Humans, the purpose of this essay is to describe the physical anatomy of the heart, and the way in which circulation works.

Essay by chai1108High School, 10th gradeA, May 2004

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Human circulation has three elements, which are the heart, the blood vessels, and the blood. All together, this is known as the cardiovascular system. Blood, which is composed of fluid plasma, with erythrocytes, leukocytes, and platelets which circulate within the blood, and account for 40% of it. Blood Plasma is a complex solution of water made with metabolites & wastes, salts & ions, and proteins. Metabolites and wastes can be glucose, lipids, vitamins, hormones, and wastes which circulate with body cells. All of these are dissolved within the plasma. Salts and ions are present because plasma is a dilute salt solution. The main ions present in the plasma are sodium, chloride, bicarbonate as well as small amounts of others which include copper, potassium, and zinc. Because blood plasma is 90 percent water, when it passed by the cells of the body, the blood would lose most of its water by means of Osmosis.

Therefore, blood contains as high concentration of proteins as the cells it passes. Therefore there is not a concentration gradient, and water is not lost by means of Osmosis. Proteins such as antibody's and globulins are also present in the plasma. These proteins make up less than half of what is needed. Serum albumin makes up most of the protein in blood to use as a counterforce. Erythrocytes are red blood cells, which carry oxygen. Leukocytes are white blood cells, which are not as common as red blood cells, and they help the bodies

immune system. Platelets are bits of megakaryocytes, which have been pinched off. Platelets play an important role in controlling blood clotting.

Blood vessels are a network of tubes that circulates throughout the body, in which blood circulates. Some functions of blood vessels are to take nutrients and wastes to appropriate locations, circulate oxygen...