4.2 Circulatory System
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23 terms
Terms | Definitions |
|---|---|
 Heart | the hollow muscular organ located behind the sternum and between the lungs |
| Arteries | blood vessels that carry blood away from the heart |
| Veins | blood vessels that carry waste containing blood from the tissues back to the heart |
| Capillaries | the smallest blood vessels which connect the smallest arteries with the smallest veins. Nourishment and fluid noramlly trapped in thick walled arteries and veins can easily pass through the delicate walls of the capillaries |
| Capillary Bed | A network of capillaries that infiltrate every organ and tissue in the body. |
| Red Blood Cells | blood cells containing hemoglobin that carry oxygen through the bloodstream |
| Kidneys | two structures located on each side of the lumbar region that filter blood and secrete impurities, forming urine. Organs that filter nitrogen wastes from blood to make urine |
| Liver | large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity |
| Nitrogenous Waste | Waste products that contain nitrogen. These products, such as ammonia and urea, are produced during protein metabolism. |
| Valve | a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it |
| Chambers | rooms, in the heart, large, hollow areas that recieve incoming blood from the lungs and tissues and ship it out again. |
| Plasma | colorless watery fluid of blood and lymph containing no cells and in which erythrocytes and leukocytes and platelets are suspended |
| Platelets | tiny, disk-shaped bodies in the blood, important in blood clot formation |
| White Blood Cells | diease fighting cells in blood |
| Anemia | a deficiency of red blood cells |
| Atria (Atrium) | the two upper chambers of the heart- the receiving areas that pool incoming blood. |
| Ventricles | the two lower chambers of the heart, and they pump blood out to the lungs and body. |
| Coronary Arteries | blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle |
| Blood Types | classified according to the presence, or absence, of certain antigens; four major blood types are A, AB, B, and O |
| Blood Pressure | the pressure that is exerted by the blood against the walls of blood vessels |
| Pulse | the rhythmic contraction and expansion of the arteries with each beat of the heart |
| Heart Attack | a condition in which blood flow to a part of the heart muscle is blocked, which causes heart cells to die. |
| Stroke | a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain |
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