What is heart
This is hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there are four chambers (as in humans), with two atria and two ventricles.
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This is hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there are four chambers (as in humans), with two atria and two ventricles.
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