Fill in the Blanks Male Reproductive SystemOnline version Vocabulary words for the male reproductive system by Lynn Johnson 1 Epididymis Semen Scrotum Urine Seminal Deferens Prostate Vesicle Bladder Urethra Cowper's Sperm Penis Testes Vas cells are produced in the glands called . These glands are protected by a sac called the . The stores the sperm cells until they have matured . From here , the sperm cells then travel in a large tube called the . Along the way , the sperm cells will pick up fluid from 3 glands ; , ( which is the most common site for cancer in men ) , and . The fluid along with the sperm cell is called . The Semen is then released from the male reproductive organ known as the . The is the tube that runs down the center of the penis that carries out the semen and also that is stored in the .