The bladder is emptied by way of the urethra, a tube passing through the prostate gland (marked with blue). The main function of the prostate is to supply fluid for sperm that has been collected in the seminal vesicles. Ejaculation is when the seminal vesicles and prostate empty. The seminal vesicles are supplied by the vas deferens from the epididymis, a tightly coiled, tube next to the testicle that provides for the storage, transmission, and maturation of sperm.
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