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12 terms

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

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Heart
a hollow muscular organ that pumps blood throughout the body
Blood
the fluid that is pumped by the heart, consists of blood cells and plasma
Blood Vessels
hollow tubes that transport blood through the body
Arteries
carry blood away from the heart
Veins
carry blood from the capillaries back to the heart
Capillaries
the exchange of gases take place in these microscopic blood vessels
Pericardium
outside, external covering of heart (2 layers)
Myocardium
inner, muscular layer of heart (middle)
Endocardium
innermost layer, smooth and same as inside blood vassel
erythrocytes
Red blood cells that transport oxygen
leukocytes
white blood cells; fight infections and are formed in the bone marrow
thrombocytes
platelets, blood-clotting cell fragments that stop bleeding