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MEDICAL ANIMATION TRANSCRIPT: The prostate is a walnut-sized gland in men. Just beneath your bladder, your prostate gland surrounds your urethra, the tube through which urine and semen exit your body. Your seminal vesicles and prostate make fluid that combines with sperm cells to create semen. During normal urination, urine flows from your bladder through the part of your urethra inside your prostate, then through the rest of your urethra to leave your body.