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4 Cards in this Set
- Front
- Back
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Circulatory System |
Complex organisms need a circulatory system to transport materials to and from all parts of the organism.
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Arteries |
carry blood away from the heart to organs and tissues. Walls are thick and elastic. Carries blood rich with oxygen (oxygenated).
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Veins |
return blood from the body’s tissues and organs to the heart. Walls are thin. Contain valves that prevent backflow of blood. Carries oxygen poor blood (deoxygenated).
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Cappillaries |
connect the arteries and veins. Microscopic (red blood cells must pass through in single file to get through). Thin walls (1 cell layer thick) allow material exchange between body and blood cells (diffusion).
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