Why is the separation of the right side and the left side of the heart useful ? How does it help birds and mammals ?

Human Circulatory System, Structure and Function of Human Heart | PadhAiPro

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TextHuman Circulatory SystemStructure and Function of Human HeartCBSE PYQ

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Assertion (A) : In the human heart ventricles have thicker muscular walls than atria. Reason (R) : Ventricles have to pump the blood into various organs.

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Why is diffusion insufficient to meet oxygen requirements of multicellular organisms like humans?

TextCellular Respiration ProcessHuman Circulatory System