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Cytoplasm of sperm cells

Why the cytoplasm of sperm cells is decreased?  Why mitochondria of the sperm cells are concentrated within the base of flagellum?

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The decreased cytoplasm of the sperm cells reduces the cell weight and offer more hydrodynamic shape for locomotion in the fluids. The large concentration of the mitochondria at the base of flagellum of the sperm cell is essential for energetic supply of flagellum.

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