Why mature erythrocytes in humans lack nucleus and mitochondria?

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Solution

The presence of nucleus would occupy space and reduce the oxygen carrying capacity. The nucleus is also not required as a mature RBC does not divide. Mitochondria is absent so that oxygen is not utilised by the RBC and all the oxygen is transported to target areas. Also, RBC does not have other organelles like Golgi apparatus and endoplasmic reticulum.

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Give the reason, why a matured mammalian erythrocyte lacks nucleus and mitochondria?

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