Fig. 4
From: Open-loop static and dynamic characteristics of the arterial baroreflex system in rabbits and rats
Baroreflex equilibrium diagram obtained under control conditions (gray broken line and curve) and during intravenous administration of angiotensin II (black solid line and curve). CSP carotid sinus pressure, AP arterial pressure, SNA sympathetic nerve activity. Angiotensin II moves the operating point from point ‘a’ to point ‘b’. If we observe the change in the operating point alone under baroreflex closed-loop conditions, angiotensin II increases AP but does not reduce SNA, which would lead to an interpretation that angiotensin II blunts the arterial baroreflex function. However, the baroreflex equilibrium diagram indicates that the neural arc resets to higher SNA without losing the ability to respond to changes in CSP (modified from Fig. 4 in Ref. 31 with permission)