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tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells of the body
flaps of tissue that open and close to allow the flow of blood in one direction only. The heart's valves are located at the entrances and exits of its chambers
small group of cardiac muscle cells in the right atrium that "set the pace" for the heart as a whole; also known as the sinoatrial node
Red Blood Cell
A cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere in the body
White Blood Cells
A blood cell that functions in defending the body against infections and cancer cells
a condition in which an artery wall thickens as a result of the buildup of fatty materials
The process by which oxygen is taken in through the lungs and carbon dioxide is released out from the lungs.
tiny air sac at the end of a bronchiole in the lungs that provides surface area for gas exchange to occur
either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine
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