The sac that provides a fluid-filled cushion for the heart is composed of (z) an inner visceral pleur and (y) an outer parietal pleura. (w) an outer parietal pericardium and (x) an inner visceral pericardium. (w) an endothelium and (x) a mesothelium. the diaphragm and (w) the pleuracardium. (x) a parietal pericardium and (z) parietal peritoneum.

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Q: Concerning the thicknessof their walls how differentare the heart chambers?

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Q: pulmonary syste

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Q: How many chambered heart does animals like amphibians and reptiles have?

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Q: Draw the interior view of the heart?

A:

Q: atrium) aorta aortic semilunar valve left ventricle left atrium lung capillaries mitral valve…

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A:

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A:

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A: