Arko Dewri Period 4 Biology 9H 4/6/2010 Chapter 34 Vocabulary • 32.1 1. Artery – Elastic, thick-walled blood vessel that carries oxygenated blood away from the heart. 2. Atherosclerosis – Circulatory system disorder in which arteries are blocked, restricting blood flow. 3. Capillary – Microscopic, one-cell-wall thick blood vessel where exchange of materials occurs between blood and body cells. 4. Heart – Hollow, muscular organ that pumps oxygenated blood to the body and deoxygenated blood to the lungs. 5. Pacemaker – Heart’s sinoatrial node, which initiates contraction of the heart. 6. Plasma – Clear, yellowish fluid portion of the blood. 7. Platelet – Flat cell fragment that functions in blood clotting. 8. Red Blood Cell – Hemoglobin-containing, disc-shaped, short-lived blood cell that lacks a nucleus and that transports oxygen to all the body’s cell. 9. Valve – One of the tissue flaps in veins that prevents backflow of blood. 10. Vein – Blood vessel that carries deoxygenated blood back to the heart.
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