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Cardio Vascular System
This is what a beating heart looks like. When it grows in size it is taking in oxygenated blood to pump to the body and deoxygenated blood to pump to thelungs.
This is an aveoli, which are the end of the tiny branches called bronchi. The aveoli has small capillaries in them which are so close that oxygen goes accross the membrane to oxynegate blood which then returns back to the heart to be pumped to the body.
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