Q7 of 42 Page 101

Which one of the following types of cells lack nucleus in humans?

Erythrocytes or RBC’s lack nucleus. This is because the lack of nucleus increases RBC’s surface area and enables it to have more Haemoglobin which is required for transport of gases.

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Which one of the following blood cells is involved in antibody production?

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The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is