Page 20 - Color Atlas Physiology

D. Control circuit response to disturbance or set point (SP) deviation

SP Controller SP Controller SP Controller
Sensor Sensor Sensor
Controlled Controlled Controlled
system Disturbance system Disturbance system Disturb-
ance
II
and Regulation
Set point
Actual value
Time Time Time
1 Stable control 2 Strong disturbance 3 Large set point shift
Control
E. Blood pressure control after suddenly standing erect
80 Subject 1
75
Quick and complete Plate 1.3
70 return to baseline
65
100 Subject 2

90 Slow and incomplete
adjustment
(deviation from set point)
Mean arterial pressure (mmHg) 100 Subject 3
80

90

80
adjustment
70 Fluctuating
110 Subject 4
100

90
Unstable control
80
10 20 30 40 50 60 70 80 s
Reclining Standing
7 7
(After A. Dittmar & K. Mechelke)
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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