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Name: _______________________________________ The Cardiovascular System The cardiovascular system is a body system that includes the ________________, _________________, and _______________________________________. Its main job is to transport _______________ and _________________ to cells in the body. It also picks up _______________ to be eliminated from the body. THE HEART: The heart is a _________________, muscular organ. Its main function is to ______________ ______________________ throughout the body. The human heart contains four chambers: 1) ______________________________ 2) ______________________________ 3) ______________________________ 4) ______________________________ ___________________: open and close to allow blood to flow in only one direction through the heart. THE BLOOD VESSELS: Blood vessels are ___________ in the body through which blood _________________. _______________________________: a type of blood vessel that carries blood away from the heart. _______________________________: a type of blood vessel that carries blood to the heart. ______________________________: the smallest kind of blood vessel through which materials are exchanged between blood and body cells. BLOOD: White blood cells _________________ infection and kill germs. Red blood cells deliver ___________________ from the lungs to the rest of the body and transport carbon dioxide from the body to the lungs. Platelets are small blood cells that help blood to _______________, or stop bleeding. ____________ is a straw colored liquid component of blood that normally holds the blood cells. It makes up about 55% of the body's total blood volume.