They produce the spermatozoa, or sperm cells, needed to fertilize female egg cells. The epididymis, a comma-shaped structure resting on the top and back surfaces of each testis, stores the sperm cells until they are expelled or ejaculated from the body. The testes also produce the male hormone testosterone, which is responsible for deepening of the voice at puberty, a more muscular build, pubic and facial hair, and other male traits. Each testis is approximately two inches long and one inch in diameter. They are suspended from the body by the spermatic cord and are enclosed in the scrotum, a pouch made of membrane and loose skin.
Cancer is really a number of diseases caused by the abnormal growth of cells.
Normally, the cells that make up the body divide and reproduce in an orderly manner, so that we can grow, replace worn-out tissue, and repair any injuries. Sometimes, however, cells get out of control. They divide too much and form masses known as tumors. Some tumors may interfere with body functions and require surgical removal, but they do not spread to other parts of the body. These are known as benign tumors.