Biology revision
- Created by: diane
- Created on: 14-11-12 17:55
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Biology : The circulatory system
- The heart has four cavities inside it
- It has divided chambers
- The top chambers are called the atria but one is called the atrium. (left atrium, right atrium)
- The two at the bottom are called ventricles. (left ventricle , right ventricle)
- Blood fills the atria and…
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