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The Cardiovascular System
Samantha Sanderson 13 May 2011
Transcript of The Cardiovascular System
Transport blood away from the heart; transport oxygenated blood only (except in the case of the pulmonary artery). Arterioles Functions:
Transport blood from arteries to capillaries; arterioles are the main regulators of blood flow and pressure. Cappilaries Functions:
To supply tissues with components of, and carried by, the blood, and also to remove waste from the surrounding cells ... as opposed to simply moving the blood around the body (in the case of other blood vessels); exchange of oxygen, carbon dioxide, water, salts, etc., between the blood and the surrounding body tissues. Venules Functions:
Drains blood from capillaries into veins, for return to the heart Veins Functions:
Transport blood towards the heart; transport deoxygenated blood only (except in the case of the pulmonary vein). Components Of Blood Red Blood Cells Role: They transport oxygen from the lungs to all of the living tissues of the body and carry away carbon dioxide. The red cells are produced continuously in our bone marrow from stem cells at a rate of about 2-3 million cells per second. White Blood Cells Role:. Most are produced in our bone marrow from the same kind of stem cells that produce red blood cells. Others are produced in the thymus gland, which is at the base of the neck. Some white cells (called lymphocytes) are the first responders for our immune system. They seek out, identify, and bind to alien protein on bacteria, viruses, and fungi so that they can be removed. Other white cells (called granulocytes and macrophages) then arrive to surround and destroy the alien cells. They also have the function of getting rid of dead or dying blood cells as well as foreign matter such as dust and asbestos. Platelets Role: Platelets, or thrombocytes, are cell fragments without nuclei that work with blood clotting chemicals at the site of wounds. They do this by adhering to the walls of blood vessels, thereby plugging the rupture in the vascular wall. They also can release coagulating chemicals which cause clots to form in the blood that can plug up narrowed blood vessels. Plasma Role: Plasma is the relatively clear, yellow tinted water (92+%), sugar, fat, protein and salt solution which carries the red cells, white cells, platelets, and some other chemicals. As the heart pumps blood to cells throughout the body, plasma brings nourishment to them and removes the waste products of metabolism. Various Blood Vessels Sources: