Are renewed air inside the lungs by mechanical phenomena, the first movement of respiratory muscles that work to change the size of the rib cage during inhalation and exhalation, and overcome resistance to the airways and pulmonary pleura.
Breathing process is divided into two consecutive phases successively and continuously both inhalation and exhalation:
Breathing process is divided into two consecutive phases successively and continuously both inhalation and exhalation:
1- the inspiration (Inspiration): It is an active process, requiring no effort from members of the respiratory system, especially the muscles to introduce air into the lungs.
- Diaphragm: Shrinking the diaphragm muscle would drop to the bottom of the Visa rib cage vertically or longitudinally and less pressure in the lungs to become less than atmospheric pressure And rushes air inside them
- External intercostal muscles: And working to raise the sternum and pushed forward which increases the size of the rib cage from the front backwards and sideways.
2- exhaling (Expiration): a passive process or automatic does not require effort to take out the air outside the body, but come the inevitable result of the process of inspiration, but in cases forced, interfere abdominal muscles and intercostal muscles internal narrowing the rib cage, rising pressure inside the lungs expelled air them through the air passages outside the body.
Respiratory rate: Inspiratory time is longer than the time exhaling, also note a moment stopped at the end of inspiration.
The average normal breathing when a man between 13 - 18 rpm On average, 16 rpm and increase this rate in cases of heat and work and agitation, which is when more women than men at two sessions.
The average normal breathing when a man between 13 - 18 rpm On average, 16 rpm and increase this rate in cases of heat and work and agitation, which is when more women than men at two sessions.
