Matching
A) Aortic semilunar valve
B) Mitral (bicuspid) valve
C) Tricuspid valve
D) Pulmonary semilunar valve
22) Prevents backflow into the left ventricle.
23) Prevents backflow into the right atrium.
24) Prevents backflow into the left atrium.
25) Prevents backflow into the right ventricle.
26) Atrioventricular (AV) valve with two flaps.
27) Atrioventricular (AV) valve with three flaps.
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Question 2) Compared to skeletal muscle, cardiac muscle ________.
A) has more nuclei per cell
B) lacks striations
C) cells are larger than skeletal muscle cells
D) has gap junctions that allow it to act as a functional syncytium
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Question 3) Matching
A) A
B) D
C) E
6) Atrial depolarization.
7) Point after which pressure begins to rise in the aorta.
8) Ventricular repolarization.
9) Point that represents the dup sound made by the heart.
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Question 4) The left side of the heart pumps the same volume of blood as the right.
Indicate whether the statement is true or false
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Question 5) Tissues damaged by myocardial infarction are replaced by connective tissue.
Indicate whether the statement is true or false
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Question 6) Select the correct statement about the structure of the heart wall.
A) Connective tissue in the heart wall aids in the conduction of the action potential.
B) The myocardium is the layer of the heart that actually contracts.
C) The fibrous cardiac skeleton forms the bulk of the heart.
D) The heart chambers are lined by the endomysium.
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Question 7) Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues.
Indicate whether the statement is true or false
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Question 8) Matching
A) E
B) D
C) B
D) A
E) C
1) Subendocardial conducting network (Purkinje fibers).
2) Sinoatrial (SA) node.
3) Atrioventricular (AV) bundle.
4) Atrioventricular (AV) node.
5) Bundle branches.
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Question 9) Select the correct statement about the function of myocardial cells.
A) The refractory period in skeletal muscle is much longer than that in cardiac muscle.
B) Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate.
C) The entire heart contracts as a unit or it does not contract at all.
D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
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Question 10) Anastomoses among coronary arterial branches provide collateral routes for blood delivery to the heart muscle.
Indicate whether the statement is true or false
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