In fact, in normal subjects the apical alveoli are ventilated adequately but have got a poor blood supply.
But such an ideal condition is seldom obtained.
In an ideal lung all the alveoli are evenly ventilated and adequately perfused with exactly the required amount of blood. Adrenaline dilates the lower airways by relaxing smooth muscles and upper airways by vasoconstriction which shrink the nasal mucosa. Reflex broncho contraction due to stimulation of the parasympathetic nerves diminishes the anatomical dead space. But the particles about 2.0 µm entering the alveoli are removed by lymphatics.įactors Influencing the Anatomical Dead Space : Removes the particulate matter in sizes more than 2.0 µm from the inspired air before it is delivered to the alveoli. Inspired air is saturated by water vapour before it reaches the alveoli of the lungs.
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