What is rbc and wbc what are their functions?

RBC refers to red blood cells. They are red in color due to the presence of hemoglobin. This haemoglobin helps on the transportation of oxygen in our body.

WBC refers to white blood cells. They are colorless. They help to fight against diseases and keep us healthy.

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Red blood cells start as immature cells in the bone marrow and after approximately seven days of maturation are released into the bloodstream. Unlike many other cells, red blood cells have no nucleus and can easily change shape, helping them fit through the various blood vessels in your body. However, while the lack of a nucleus makes a red blood cell more flexible, it also limits the life of the cell as it travels through the smallest blood vessels, damaging the cell's membranes and depleting its energy supplies. The red blood cell survives on average only 120 days.

White blood cells protect the body from infection.