BIO 365S Lecture Notes - Lecture 20: Cardiac Output, Stroke Volume, Inotrope
CARDIAC OUTPUT
CO = SV * HR
CARDIAC OUTPUT EQUALS STROKE VOLUME TIMES HEART RATE
If HR increases, what will happen to CO?
-Increase
If SV decreases, what will happen to CO?
-Increase
Stroke volume * heart rate = cardiac output.
When running marathon, spending hours of heart working and
stretching and will adapt, become a little longer, ventricles being bigger
(good and bad – smokers also have bigger ventricles but just depends
on the type of protein that causes it), gets better at beating. At rest,
do’t eed a irease i CO, ad sie heart a hold ore lood ad
is stronger, so heart rate is lower.
Parasympathetic stimulation hyperpolarizes themembrane potential of the autorhythmic
cell andslows depolarization, slowing down the heart rate.
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Sympathetic stimulation and epinephrine depolarizethe autorhythmic cell and speed up the
pacemakerpotential, increasing the heart rate.
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