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. A decrease in arteriolar radius decreases blood volume and adversely affects MAP is a result of increased MAP increases total peripheral resistance and MAP more than one of the above none of the above

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1. A decrease in arteriolar radius

 

decreases blood volume and adversely affects MAP
is a result of increased MAP
increases total peripheral resistance and MAP
more than one of the above
none of the above

 

2. Mean arterial pressure (choose all correct):

 

Is closer to systolic pressure than to diastolic
Is directly proportionate to total peripheral resistance
Is inversely proportionate to blood volume
equals (systolic + 2* diastolic)/3

 

3. Heart sound 2 (choose all correct)  

 

is generated by the closing of the atrioventricular valves
occurs when the aortic and pulmonary valves backfill with blood
marks the beginning of isovolumic relaxation
is associated with turbulence during atrial contraction

 

4. The end systolic volume is

 

the volume of blood left in the ventricle after contraction
greater than end diastolic volume
usually equal to zero
the ejection fraction

 

5. Which pressure is lowest during ventricular systole?

 

right ventricular
left ventricular
atrial
aortic

 

6. After the depolarization is slowed through the AV node, it passes next through the

 

internodal pathways
SA node
Bundle branches
Purkinje fibers

 

7. Contractile cells of the heart are different from pacemaker cells in that contractile cells (choose all correct)  

 

have calcium action potentials
control rate of contraction
have a calcium plateau and a long refractory period
have a true resting potential

 

8. Autorhythmic (pacemaker cells) are unique in that they have

 

depolarization-gated calcium channels
potassium repolarization
hyperpolarization-activated channels
depolarization-gated sodium channels

 

9. Intercalated discs (choose all correct)

 

electrically connect cardiac muscle cells to one another
are a form of local communication
partly consist of direct cytoplasmic connections between cells
partly consist of desmosomes

 

 10. How is cardiac muscle different from skeletal muscle?
contracts by the sliding filament mechanism
can vary force of contraction by varying calcium entering the cell
does not tetanize
two of the above are correct
all correct

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