Laughter is the Best Medicine

Humor is infectious. The sound of roaring laughter is far more contagious than any cough, sigh, or sneeze. When laughter is shared, it binds people together and increases happiness and intimacy. In addition to the domino effect of joy and amusement, laughter also triggers healthy physical changes in the body. Humor and laughter strengthen your immune system, boost your energy, diminish pain, and protect you from the damaging effects of stress. Best of all, this priceless medicine is fun, free, and easy to use.
(Adaptado de http://www.helpguide.org/life/humor_laughter_health.htm. Acesso em 21/08/2010.)



a) O texto considera o riso mais contagioso do que outras manifestações físicas. Indique duas dessas outras
manifestações.

b) Explicite os efeitos positivos do bom humor e do riso para a saúde física das pessoas.