Cancer is when cells in the body grow out of control. So if a prostate cell starts to grow out of control, it forms a tumor that's called prostate cancer. But let's start with the most important question. What is the prostate? The prostate is part of the urinary tract in men. Urine is made in the kidneys. They travel down tubes called the ureters into the bladder. The bladder fills up with urine. When the bladder squeezes and the urine exits the body out the urethra, it first goes through a channel right through the middle of the prostate gland. The prostate gland is about the size of a walnut in most men. So the prostate is right next to the bladder and a man urinates right through the center of it when the urine is expelled. The prostate has another job and that's being involved in ejaculation. The ejaculate is made up of three things: fluid from the seminal vesicles, which are attached to the prostate, some fluid from the prostate itself and sperm.
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