1, inspiratory process
Principle: the pressure in the chest cavity decreases, the gas pressure in the alveoli is lower than atmospheric pressure, and the gas enters the alveoli. Physiology: Diaphragm contracts and chest volume increases; Relaxation of intercostal muscles and abdominal muscles, thoracic dilatation; The alveolar wall retracts elastically and the alveoli expand.
2. Exhale process
Principle: When the pressure in the chest cavity increases, the gas pressure in the alveoli is higher than atmospheric pressure, and the gas is discharged from the alveoli. Physiology: Diaphragm relaxes and thoracic volume decreases; Intercostal muscle and abdominal muscle contract, thoracic contraction; The elasticity of alveolar wall increases and alveoli shrink.
3. Sleep state
Principle: In a quiet state, the body's demand for oxygen is low, the breathing frequency slows down, and the depth of each breath decreases. Physiology: In a quiet state, the human body exchanges about 10-20 breaths per minute, and about 30 ml of oxygen enters the blood and 50 ml of carbon dioxide is discharged in each breath.
4. Motion state
Physiology: During exercise, due to the needs of muscles, the frequency and depth of breathing will increase to meet the body's demand for oxygen.
The importance of the four processes of breathing
Breathing is one of the basic activities of life, which involves many important functions of our body. The process of breathing can be divided into four stages: inhalation, pause, exhalation and inhalation again. These four processes are isomorphic to our breathing cycle.
Inhalation is the process that we inhale oxygen from the outside and transport it to the lungs. When we inhale, the diaphragm will move downward, which will expand the lungs, thus increasing the capacity of the lungs. At the same time, the chest will become larger, allowing the lungs to inhale more air. In this process, our noses and mouths are used to inhale air.
The importance of the four processes of breathing is that they jointly maintain the life activities of our bodies. If we can't breathe normally, then our bodies can't get enough oxygen and nutrition, and we can't get rid of waste and carbon dioxide in our bodies. Therefore, keeping good breathing habits is very important for our health.