Key Volume & Output Terms
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Last updated 7:20 PM on 3/27/26
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9 Terms
1
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EDV
Blood in ventricle before contraction (-120 ml/beat)
2
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ESV
Blood Left after contraction (50ml/beat)
3
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SV
blood pumped per beat (70ml/beat)
EDV - ESV
4
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Ejection Fraction
% of blood pumped out
Normal: > or = 55
5
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Preload
Stretch of ventricle before contraction
Depends on venous return
↑ preload → ↑ stroke volume
6
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Contractibility
Strength of contraction
Increased by sympathetic activity (adrenaline)
7
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Afterload
Pressure that heart must pump against to eject blood
Major Pressure= arterial blood pushing on SL valves
Caused by blood pressure
↑ afterload → ↓ stroke volume
8
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Venous Return
Amount of blood returning to the heart
9
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Cardiac Output
blood pumped per minute
SV x HR
