Prompt: Plot the tension in the left ventricle over the length of cardiac cycle, assuming that only the diameter changes during the cardiac cycle.
Prompt: Plot the tension in the left ventricle over the length of cardiac cycle, assuming that only the diameter changes during the cardiac cycle.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:Prompt: Plot the tension in the left ventricle over the length of cardiac cycle, assuming that
only the diameter changes during the cardiac cycle.
Remember:
-ventricular filling : small pressure changes (almost none) but radius change
-ventricular isovolumetric contraction: big pressure changes (increasing over time) and radius changes
-ventricular contraction: small pressure changes (but significant) and radius change
-ventricular isovolumetric relaxation: big pressure changes (decreasing over time) and radius changes
HINT: when calculating tension deltaP it is the difference between the pressure inside vs the outside of the ventricle wall.
Relationship between pressure, volume and ECG
Systole
ejection
Pressure (mmHg)
Volume (mL)
ECG
120
80
40
130
90+
Aortic valve
opens
Mitral valve
closes
EDV
Ejection
Contraction
Aortic valve
closes
Diastole
filling
Mitral valve
opens
Filling
--ESV
Relaxation
Filling
Aortic pressure
Left ventricular pressure
Left atrial pressure
Left ventricular
volume
Hint: utilize PV loop to guide you in creating the cardiac cycle diagrams.
Diastole
Systole
LVP (mmHg)
LV Vol (ml)
LVP (mmHg)
100-
0
100
0
150
100
50
0
T
a
Aortic 2
Valve
Opening
Mitral
Valve
Closing
Aortic
Valve
Closing
ESPVR
Mitral
Valve
Opening
0
4
b
3
P
с
50
ESV
3
Time
a
SV
-EDV
100
a
Aortic
Valve
Closing
Mitral
Valve
Opening
LV Vol (ml)
ESV
Aortic
2 Valve
Opening
Mitral
Valve
b closing
1
EDV
EDPVR
150
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