Physio Block 3


What drug decreases preload?


Nitroglycerin


What drug decreases afterload?


Hydralazine


Cardiac output equals what?


Stroke volume


The largest blood volume in the CVS is found where?


1.venous side2.pulmonary circulation


Blood flow is equal to what?


difference in pressure/ resistance


What is the prime determinant of viscosity?


hematocrit


What lowers hematocrit?


anemia


What is polycythemia?


Increase in RBC #


Resistance in proportional to what?


viscosity x length of bv/r^4


What are the 2 type of flow in the system?


LaminarTurbulent


Which flow, laminar or turbulent produces more resistance?


Turbulent


Which flow produces murmurs?


turbulent


Which is a layered flow?


Laminar


Which is a non layered flow?


turbulent


Reynolds number measure what?


turbulent blood flow


Reynolds number is proportional to what?


diameter x velocity x density/ viscosity


Which artery would have a greater pulse pressure, a compliant one or a stiff one?


stiff one


What is the most compliant artery in the system?


the Aorta


Mean arterial pressure is equal to what?


1. diastolic pressure + 1/3 pulse pressure2. 2/3 diastolic pressure + 1/3 systolic pressure3.CO x TPR


What function does angiotensin II have?


vasoconstriction


What is the differential between Wilsons and Menke?


Wilson--- high copperMenke--low copperboth have low ceruloplasmin


Williams syndrome is caused by?


decreased elastin


What disease is characterized by elfie facies?


Williams


The left heart's cardiac output is equal to what?


Right heart's cardiac output


Beta adrenergic receptors are found where?
What do they mediate?
What do they bind?


on arteriolesvasodilationepinephrine