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These tiny chambers are called alveoli. They are not exclusive to just reptiles, but are part of the circulatory system of all vertebrates.

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Lining of the heart is called what?

Endocardium


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The membrane lining the inner surface of the uterus, or womb.


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What is the innermost layer of the heart that lines its inner chambers valves and is continuous with the innermost layer of the arteries veins and capillaries of the body?

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