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BIO 169: EXAM 2 STUDY GUIDE
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32. Define preload.
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the amount of stretch in the heart wall before contraction, at the end of ventricular filling
EDV measures Preload
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Terms in this set (24)
32. Define preload.
the amount of stretch in the heart wall before contraction, at the end of ventricular filling
EDV measures Preload
33. How is the Frank-Starling law related to stroke volume?
Frank-Starling (Starling's) law:
SV of the heart increases in response to an increase in the blood volume/filling the heart when all other factors remain constant
Increased EDV, increased SV
34. How does heart rate affect stroke volume?
Increased HR = Increased EDV = Increased SV and CO in a normal heart
HR goes too high then SV will decrease because the ventricles will not have enough time to fill so CO will eventually decrease (tachycardia).
35. Define afterload.
the Resistance the Ventricle must overcome in the Aortic Artery to Eject Blood
36. Define chronotropic and inotropic agents.
Chronotropic agents: factors that change heart
rate/rhythm (ex. can affect SA
Node)
Inotropic agents: alter force of contraction, usually
through Ca++ release from
sarcoplasmic reticulum
