Name the four blood groups in human beings. On what basis are they named?
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The four blood groups in human beings are A, B, AB and O. They are named on the presence or absence of specific antigens.
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What is double circulation?
Name the double layered protective covering of the heart.
What prevents mixing of blood between auricles and ventricles. How?
Explain the process of blood circulation in the body with the help of a schematic diagram.