Cardiovascular/Circulatory System Organs (3), Functions (3), The Heart's Layers (3), Blood cells (3)

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a hollow muscular organ that pumps blood throughout the body


the fluid that is pumped by the heart, consists of blood cells and plasma

Blood Vessels

hollow tubes that transport blood through the body


carry blood away from the heart


carry blood from the capillaries back to the heart


the exchange of gases take place in these microscopic blood vessels


outside, external covering of heart (2 layers)


inner, muscular layer of heart (middle)


innermost layer, smooth and same as inside blood vassel


Red blood cells that transport oxygen


white blood cells; fight infections and are formed in the bone marrow


platelets, blood-clotting cell fragments that stop bleeding

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