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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).
Normal Ranges Of Respiratory Rate. Breathing is a process that we do naturally. One does not apply his mind to breathe. The respiration is controlled by nerve cells in the reticular formation of the brain stem. These cells send impulses to the diaphragm and to the muscles through the nerves.