Fig. 4.1 illustrates a human bronchiole together with some specialised cells from the inner lining that encircles the lumen.
(a(i))[3]
Name the cell labelled X and state what it does.
(a(ii))[2]
Name the cell labelled Y and state what it does.
(b(i))[3]
Suggest the effects bronchoconstriction has on a person.
(b(ii))[1]
Describe one effect of nicotine on the circulatory system.
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