Page 218 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Factors influencing cardiac action
1 Increase in filling (preload) 2 Increase in blood pressure (afterload)
(See preceding Plate A T 1 T T 2
for explanation of curves)
Transitional phase (t): Stroke volume
Blood pressure
T
Blood pressure New after- Blood pressure rises while S 2 normalizes
stroke volume
loaded
(SV 2 =SV) despite
decreases
increased
peak curve
blood pressure:
S t Increased work of Stroke Volume
D t D 2
Work
S S 1
D D 1 Regulation
Work A 2
V Ü
Ventricular volume
A 1
M V A Ventricular volume Plate 8.10
ESV SV
ESV t SV t
ESV SV
ESV 2 SV 2
EDV
B. Venous return
3 Increase
in contractility T 3
New Venous return = cardiac output
afterloaded
Blood pressure heart Pulmonary Left
peak curve
Right
heart
T
Suction via circulation
lowering of
Same stroke cardiac
volume at valve plane
higher pressure
Negative
or pressure in thorax
S 3
Higher stroke
volume Venous Inspiration
D 3 (SV 4 >SV) at valves
same pressure
Arbeit
S 4
Positive pressure
in abdominal cavity
Muscle pump
V 4 Systemic
Ventricular volume Blood pressure circulation
ca. 15mmHg
SV
205
SV 4
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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