Why is vital capacity of the lungs an important indicator of health? List the basic rules of breathing hygiene.

The vital capacity of the lungs is an indicator that determines the maximum amount of oxygen that a person can take into the lungs after maximum exhalation. This indicator directly affects not only health, but also human life, since it is from the lungs that oxygen gets to the rest of the organs and systems. For the proper functioning of the respiratory system, it is necessary to prevent the ingress of harmful substances and mechanical impurities into them, to try to cover the respiratory tract in the cold season, and also to exclude bad habits.