Nicoll, Paul A.
November 1966
Angiology;Nov1966, Vol. 17 Issue 11, p851
Academic Journal
Unanesthetized small bats of the genus Myotis, when inhaling cigarette smoke, show a diphasic response of the minute vessels in their wing membrane. Initially there is an increase in vasomotion evidenced by enhanced magnitude of contraction in the arcuate and terminal arterioles, frequently accompanied by an increase in the duration of the contraction phase at the expense of the relaxation phase. This is soon replaced by an inhibitory action that blocks active contraction of the muscle cells in the minute vessels, resulting in greatly lengthened dilation and even complete cessation of all vasomotion. The rapid onset of the inhibitory condition that is also reflected by cardiac slowing and an abrupt fall in central blood pressure makes it difficult to evaluate any contribution of the initial increase in vasomotion of the arcuate and terminal arteriole in the tobacco smoke response usually observed in human subjects.


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