Circulatory System

4. perform the function of destroying disease causing germs
5. thin-walled blood vessels that are less elastic than arteries; they contain cuplike valves to prevent backflow and carry impure blood from the various capillaries back to the heart and lungs
6. small vessels that connect the capillaries to the veins; they collect blood from the capillaries and drain it into veins
10. tiny, thin-walled blood vessels that connect the small arteries to the veins
13. Circulation circulation of blood from the heart throughout the body and back again to the heart
14. also known as red corpuscles or erythrocytes; produced in the red bone marrow; blood cells that carry oxygen from the cells back to the lungs

1. much smaller than red blood cells; contribute to the blood-clotting process, which stops bleeding
2. sends blood from the heart to the lungs to be purified, then back to the heart again
3. tube-like structures that transport blood to and from the heart, and to various tissues of the body; includes arteries, arterioles, capillaries, venules, and veins
7. small arteries that deliver blood to capillaries
8. nutritive fluid circulating through the cardiovascular system to supply oxygen and nutrients to cells and tissues and to remove carbon dioxide and waste
9. thick-walled muscular and flexible tubes that carry oxygenated blood from the heart to the capillaries throughout the body
11. muscular cone-shaped organ that keeps the blood moving within the circulatory system
12. fluid part of the blood and lymph that carries food and secretions to the cells and carbon dioxide from the cells