Ejaculation is the discharge of semen from the penis. Impulses from the spinal cord centers cause contractions of the epididymis and vas deferens, which expel sperm into the urethra. Two to four cubic centimeters of semen, containing approximately 300 million sperm, are expelled at each ejaculation. It is the smallest cell in the male body and is continuously produced by the testicles from puberty onward. A sperm cell contains twenty-three chromosomes, including the X or Y chromosome that determines gender.
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