. A decrease in arteriolar radius

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

 

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