During ejaculation, the propulsion of sperm from the urethra to the exterior, about 2–5 mL (0.07 oz) of semen (ejaculate) is expelled. Each milliliter of ejaculate contains about 20–100 million sperm/milliliter. The fluid from the seminiferous tubules contributes 5% of the semen, and the acces-sory glands provide the rest. Thus, the fluid compo-nent of the semen is a mixture of secretions from the seminiferous tubule and the accessory glands.
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