it is concluded that inhalation of aerosol of hist or ach produced two kinds of effects on respiration : ( 1 ) increased respiratory rates with reduced tidal volume and with bronchoconstriction which were vagus-dependent ( spontaneous breathing model ) , and ( 2 ) bronchoconstriction which was a direct response of smooth muscle without involving a reflex ( artificial ventilation model ) .
C0004048
inhalation
C0035203
respiration