Significados de irritative motions en inglés

A great additional quantity of pleasurable sensation is occasioned by this increased exertion of the irritative motions.

And other irritative motions become decreased, as the pulsations of the arteries, from the extra-derivation or exhaustion of the sensorial power.

There is another tribe of desires, which are commonly termed appetites, and are the immediate consequences of the absence of some irritative motions.