Breathing and Exchange of Gasses
- The volume of air that a lung can receive, hold and expel under different conditions is called lung volume.
- Tidal volume is the volume of air inspired / expired during normal breathing (6000 to 8000 ml/min)
- Inspiratory Reserve Volume (IRV) 2500-3000 ml of air is the amount of air that is forcefully inspired after normal inspiration.
- ERV is the amount of air forcefully expired and is 1000 to 1100 ml.
- Volume of air, still remain in lung after the most forceful expiration is called residual volume and that is 1100-1200 ml.
- Combination of 2 or more pulmonary Volume is pulmonary capacity.
- Inspiratory capacity : TV + IRV
- Expiratory capacity : TV + ERV
- Functional residual capacity : RV + ERV
- Vital capacity : TV + IRV + ERV
- Vital capacity in generally higher for athletes, mountain dwellers, young children and men than women.
- Total lung capacity is the combination of all lung volume ie., TV + IRV + ERV + RV
- Dead space volume in lungs is about 150 ml that do not enter into respiratory zone rather stays in conduction zone of lungs.
Watch this video for the topic Respiratory volume from 12:13 to 25:08
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