The blood vessels dilate to increase the "blood traffic" through the lungs to carry more oxygen to the muscle. The lungs work harder (faster respiratory rate) to increase the rate of oxygen/carbon dioxide exchange in the lungs.
Well the 3 parts of the health triangle are physical, mental and social health
A discharge from either the vagina or penis is common
Occupy yourself with activities or just drink water
Life style, environment toxins, and Gene mutations