| $RBCs$ | $WBCs$ |
| $(1)$ They are red in colour due to the presence of the respiratory pigment $Hb$ (hemoglobin). | $(1)$ They are colourless as they lack respiratory pigments. |
| $(2)$ They are devoid of a nucleus in mature cells. | $(2)$ They possess a nucleus. |
| $(3)$ They participate in the transport of respiratory gases ($O_2$ and $CO_2$). | $(3)$ They provide a defense mechanism against pathogens. |
| $(4)$ Their count is approximately $5.0-5.5$ million/$mm^3$ of blood. | $(4)$ Their count is approximately $6000-8000$ cells/$mm^3$ of blood. |
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