Lung volumes and composition of air

• Inhaled percentag: nitrogen- 78, oxygen- 21, carbon dioxide- 0.04
• Exhaled percentage: nitrogen- 78, oxygen- 16, carbon dioxide- 4
• Nitrogen stays the same as the body does not use it or produce it
• Oxygen levels decrease because it is used for energy production or recovery
• Carbon dioxide increases as it is a by product made during aerobic energy production
• Lung volume is the hoe much air the lungs can hold, capacity of the lungs
• Tidal volume is the amount of air inspired or expired in a normal breath
• At rest the breathing is slower and shallower as there is less oxygen needed and less carbon dioxide to be breathed out
• During excercise tidal volume increases because the body needs more oxygen and needs to breathe out more carbon dioxide
• Vital capacity is the maiximum amount of air the lungs can expire after the maximum they insoire