The human circulatory system The human circulatory is one of, if not the, most important system in the body. ?It consists of such organs as the heart, and lungs? (Dunbar 4). ?However every organ and organ system in the body is nourished and kept alive through the use of the circulatory system? (2-4). The main organ in the circulatory system is the heart. ?Basically, the heart is a pump that keeps fresh blood coursing through your …showed first 75 words of 1854 total…

…showed last 75 words of 1854 total…vessel is cut or broken, platelets stick to the damaged surface and to one another. As they pile up, they form a temporary seal over the injury. At the same time, the platelets release substances that start the process of blood clotting. Platelets are the smallest of the formed elements. They measure only about two to four microns in diameter. A micro liter of blood contains one -hundred -fifty -thousand to four -hundred -thousand platelets? (425).