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Normal respiration rate in adults is 12 breaths/min. Normal breathing, as we discussed, is strictly nasal (in and out), mainly diaphragmatic (i.e., abdominal), slow (in frequency) and imperceptible (or small/shallow in its volume).
The gaseous exchange phase of respiration consists of two phases: Inspiration and Expiration. These are accomplished by the alternate increase and decrease of the capacity of the thoracic cavity. The normal rate of respiration for a healthy adult individual is 16 to 20 breaths per minute.he gaseous exchange phase of respiration consists of two phases: Inspiration and Expiration. These are accomplished by the alternate increase and decrease of the capacity of the thoracic cavity. The normal rate of respiration for a healthy adult individual is 16 to 20 breaths per minute.