When a boy reaches puberty the production of testosterone in his body increases (just as oestrogen production increases in girls). Testosterone, which is produced in the testicles and then travels through the blood throughout the body, causes the cartilage of the larynx to grow. Along with the larynx, the vocal cords grow significantly longer and thicker. Also, the facial bones begin to grow.
Cavities in the sinuses, the nose and the back of the throat grow bigger, creating more space in the face in which to give the voice more room to resonate. All these factors work together to make the voice deeper.
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