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Because red blood cells have no means of leaving the blood vessels. They are too large to fit through the openings of fenestrated capillaries, and have no other method of extravasation either (unlike white blood cells). Even though white blood cells are larger, the are capable of changing their shape to fit through the tiniest of openings, and can also move on their own. Red blood cells are merely swept along with the current.

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Does a lymph contain white blood cells?

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