1. Beard, moustache, chest hair, armpit hair and pubic hair begin to grow.
2. Due to excessive secretion of oil glands, the face becomes shiny and acne occurs on the face.
3. Body weight and height increase, chest and shoulders widen.
4. The larynx enlarges and the vocal cords change, the voice becomes heavier and deeper.
5. Permanent teeth begin to emerge.
6. The seminal vesicles, prostate gland and Kauper’s gland enlarge and begin to secrete.
7. Enlargement of the penis and testicles, ejaculation occurs and sleepiness.
8. Fructose appears in seminal fluid.
9. Muscles become strong and toned.
10. Accumulation of fat on the face and stomach.
11. Heart rate and blood pressure increase.