Fig. 4From: High levels of circulating angiotensin II shift the open-loop baroreflex control of splanchnic sympathetic nerve activity, heart rate and arterial pressure in anesthetized ratsEquilibrium diagrams between the arterial baroreflex neural and peripheral arcs. The dashed and solid curves represent the open-loop characteristics of the baroreflex neural arc under the control and ANG II-treated conditions, respectively. The dashed and solid lines represent the open-loop characteristics of the baroreflex peripheral arc under the control and ANG II-treated conditions, respectively. The open circle indicates the closed-loop operating point under the control condition. ANG II causes an upward shift in the peripheral arc. If ANG II does not affect the neural arc, the closed-loop operating point would be at the point depicted by the open triangle. In this case, the estimation of baroreflex control of SNA based on the closed-loop operating points (the open circle and open triangle) approximates the slope of the baroreflex neural arc (dashed curve). ANG II, however, causes a rightward shift in the neural arc. Thus, the estimation of the baroreflex control of SNA based on closed-loop operating points (the open and filled circles) does not match the slope of the neural arc under either the control (dashed curve) or ANG II-treated condition (solid curve)Back to article page