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Open-loop transfer function of the baroreflex neural arc, H1 (A), the input power of the carotid sinus pressure (CSP), IP1 (B), and the output power of the sympathetic nerve activity (SNA), OP1 (C). The neural arc revealed high-pass or derivative characteristics, which means that dynamic gain increased as the frequency increased from 0.01 to 0.5 Hz.
