Describe the process of external respiration. How do you inhale and exhale?

Ventilation of the lungs occurs during respiratory movements. In a calm state, an adult makes 16-18 respiratory movements per minute. Each respiratory movement consists of two acts – inhalation and exhalation. Inhalation occurs due to an increase in the volume of the chest, achieved by the contraction of the intercostal muscles and the muscles of the diaphragm. Following this, the lungs expand, which leads to a decrease in pressure in them, and atmospheric air is absorbed into the lungs. Exhalation at rest occurs mainly passively. Thus, the ribs fall under the action of gravity, the diaphragm rises due to the pressure of the internal organs, and the volume of the chest is reduced. The pleural cavity and lungs are compressed as a result, and the pulmonary air comes out.

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