Ch#13 | Gaseous Exchange | Lec #17 | LUNG CAPACITIES (FSc Biology part 1)@riffatjahan

LUNG CAPACITIES:
In an adult human being when the lungs are fully inflated the total inside capacity of lungs is about 5 liters.
At rest or asleep the exchange is only about half a liter.
The volume of air taken inside the lungs and expelled during exercise is about 3.5 liters.
In other words, there is a volume of 1.5 liters even during exercise, which can be expelled.
Normally, at rest we inhale and exhale 15-20 times per minute.
During exercise the breathing rate may rise to 30 times per minute.
The increased rate and depth of breathing during exercise allows more oxygen to dissolve in blood and supply it to the active muscles.
The extra carbon dioxide, which the muscle puts into the blood, is removed by deep and fast breathing.
There is a little change in the composition of inhaled and exhaled air during rest of exercise in most of the constituent of the air as seen in the table below.
Chemical composition of inspired and expired air changes in the composition of the breathed air.
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