Circulatory system
The circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate. It includes the cardiovascular system, or vascular system, that consists... Wikipedia
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All cells in the body need to have oxygen and nutrients, and they need their wastes removed. These are the main roles of the circulatory system.
Mar 12, 2010 · Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) ...
The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry ...