lung volumes

• Tidal volume is the volume of air that is inhaled in and exhaled out with each breath when there is a normal rhythmic breathing at rest
• Inspiratory reserve volume is the maximum additional volume of air that can be inhaled in after a normal tidal inspiration
• expiratory reserve volume is the maximum additional volume of air that can be exhaled out after a normal tidal expiration
• vital capacity is the maximum volume of air exchanged after a forced inspiration followed immediately by a forced expiration
• residual volume is the volume of air that remains in the lungs at all times and cannot be expelled even after forced expiration
• total lung capacity is the total volume of air that the lungs can hold
• vital capacity= TV+IRV+ERV
• Total lung capacity= VC+RV
• ventilation rate= tidal volume x number of breaths per minute