1.

P in the heart have thicker muscular walls than Q do. Also, R ensure that blood does not flow backwards when the atria or ventricles contract.P is ___Q is ___and R is ___

Answer»

P in the heart have thicker muscular walls than Q do. Also, R ensure that blood does not flow backwards when the atria or ventricles contract.

P is ___

Q is ___

and R is ___


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