Page 20 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

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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