1. A decrease in arteriolar radius decreases blood volume and increases total peripheral resistance, which increases mean arterial pressure more than other factors. 2. Mean arterial pressure is closer to systolic pressure than diastolic, is directly proportional to total peripheral resistance, and is inversely proportional to blood volume. 3. Heart sound 2 occurs when the atrioventricular valves close and marks the beginning of isovolumic relaxation.

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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

2. 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

3. 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

4. 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

5. usually equal to
zero
the ejection
fraction
5. Which pressure is lowest during ventricular systole?
right
ventricular
left
ventricular

6. atri
al
aorti
c
6. After the depolarization is slowed through the AV node, it passes next
through the
internodal
pathways
SA
node

7. 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

8. 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

9. 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

10. 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

11. does not
tetanize
two of the above are
correct
all
correct