Abstract
Interventions confined to the region adjacent to the VMS can produce both respiratory and circulatory effects. Although it has been suggested that both breathing and vasomotor changes arise from the same neural elements near the VMS, our own investigations indicate that the neurons involved are closely linked but not identical. This belief is supported by recent studies which show that AII and angiotensin antagonists microinjected into the rostral portion of the VMS can significantly modify blood pressure and respiration but can produce effects of different sign. These observations, coupled with previous studies of the VMS, indicate the possibility that regions near the VMS may contribute to integration of circulatory and respiratory responses.
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