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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).
For example, his normal respiration rate is only 8 breaths/min. Here are his numbers for normal breathing: - normal minute ventilation: 4 l/min; - normal tidal volume (air volume breathed in during a single breath): 500 ml;