KINESIOL 4SS3 Lecture Notes - Lecture 5: Functional Residual Capacity, Perfusion, Vital Capacity
12 Apr 2016
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Occupies about 150ml (20-30%), which is the dead space not much change with aging. Anatomical vs physiological dead space: physiological: mismatch between venilaion and perfusion. Part of the respiratory system that does not paricipate in gas exchange. Alveolus that"s not perfused with any blood supply even though its fully inhaled with o2 with no supply, there will be no gas exchange. Could also have alveoli that is perfused but not illed with air. Raio of dead space volume to idal volume. At 30, doesn"t mater if you"re trained or not in terms of dead space venilaion. Respiratory system isn"t a limiter for exercise unless you have a disease. Trained person will have a higher o2 uptake. Older: greater proporion of venilaion from dead space, goes down with exercise, dead space declines because you can expend more, geing more work of respiratory muscles, you venilate lungs beter than at rest. Normal breathing is idal volume, 500-600ml (depends on size of person)
