Physiology semester test work

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Action Potential

The action potential

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Resting membrane potential

Resting membrane potential (RMP)

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Physiology & Homeostasis

Physiology & Homeostasis

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Baroreceptor Reflex

BP = CO x total resistance x BV

BP= (SV x HR) x (Art r x Vis x VLx Turb) x BV

SV: stroke volume

-end diastolic volume (governed by venous return)

-end systolic volume (governed by contraction of heart muscle)

-increase in SV = increase in BP

-Sympathetic vs parasympathetic

-increase SV -decrease SV

HR

-heart rate

Art r (Arteriole radius)

-most acute factor that can change BP

-arterioles: (controlled by sympathetic nervous system)

-dilates= BP drops

-constricts (with sympathetic stimulation)= BP increases

Vis (Viscosity)

-measurement of fluidity of solution

-higher Vis = higher BP

-determined by number of red blood cells

-increase in RBCs = increase in Vis

-decrease in RBCs = decrease in Vis

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Heart rate

Increased HR

-increases BP

-HR is stimulated by sympathetic

-adrenaline & noradrenaline

Decreased HR

-decreases BP

-HR is inhibited by parasympathetic