•Has four chambers - two at the top, two at the bottom
•Top two chambers- the atria (recive blood)
•Bottom two chambers - the ventricles ( pump blood)
•Made of tissues
•Pumps blood around the body by contracting and relaxing
•Oxygenated blood- left
•Deoxygenated blood- right
•To prevent back flow, valves open and close in the large arteries.
•Valves found between the atria and the ventricle
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