Biology 2060 - Anatomy and Physiology II » Summer 2020 » Quiz 3
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Question #1
Which pair is located more anteriorly in a heart in normal position?
A.
Left atrium and right ventricle
B.
Left atrium and left ventricle
C.
Right atrium and left atrium
D.
Right atrium and right ventricle
E.
Right atrium and left ventricle
Question #2
Most of the calcium that triggers contraction of cardiac muscle comes
A.
from the Golgi apparatus of the cell.
B.
from the sarcoplasmic reticulum of the cell.
C.
into the cell through voltage-gated channels in the sarcolemma.
D.
into the cell through leakage channels in the sarcolemma.
Question #3
The right border of the heart is supplied by the
A.
posterior interventricular artery.
B.
great cardiac vein.
C.
circumflex artery.
D.
right marginal artery.
E.
anterior interventricular artery.
Question #4
During the S-T segment, what is occurring within cardiac muscle cells?
A.
Sodium channels are beginning to open in ventricular cells and calcium is entering through slow channels in atrial cells.
B.
Sodium is rapidly diffusing out of atrial muscle cells.
C.
Calcium is entering and potassium is leaving ventricular cells.
D.
Potassium is entering atrial cells and sodium is leaving ventricular cells.
Question #5
The layer of the heart wall composed of cardiac muscle tissue is the
A.
pericardial cavity.
B.
pericardium.
C.
myocardium.
D.
pectinate muscle.
E.
endocardium.
Question #6
Which of the following would cause a decrease in cardiac output?
A.
An increase in afterload
B.
Addition of positive inotropic agents
C.
An increase in heart rate
D.
An increase in venous return
Question #7
The term "epicardium" is another name for the
A.
myocardium.
B.
mediastinum.
C.
external layer of the fibrous pericardium.
D.
parietal layer of the serosal pericardium.
E.
visceral layer of the serosal pericardium.
Question #8
All of the heart's sulci house blood vessels that supply the myocardium.
A.
TRUE
B.
FALSE
Question #9
The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung. The pulmonary trunk is a(n)
A.
capillary.
B.
vein.
C.
artery.
Question #10
Large doses of certain stimulants can lead to dangerous increases in heart rates. Such a stimulant is a
A.
positive chronotropic agent.
B.
negative inotropic agent.
C.
negative chronotropic agent.
D.
positive inotropic agent.
Question #11
Which type of muscle cell exhibits a longer refractory period?
A.
Skeletal muscle cell
B.
Cardiac muscle cell
Question #12
Myofibrils within cardiac muscle cells are aligned in sarcomeres.
A.
TRUE
B.
FALSE
Question #13
As with action potentials in other types of cells, the repolarization of cardiac muscle cells involves the
A.
exit of potassium through voltage-gated channels.
B.
simultaneous closure of sodium channels and opening of calcium channels.
C.
binding of ACh to ACh receptor.
D.
entrance of calcium through voltage-gated channels.
E.
entrance of sodium through voltage-gated channels.
Question #14
How many half-moon shaped, pocketlike cusps are found in each semilunar valve?
A.
4
B.
2
C.
3
D.
1
E.
6
Question #15
Nodal cells contain fast voltage-gated calcium channels.
A.
FALSE
B.
TRUE
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