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Chapter 12: The Cardiovascular System: The Heart
Chapter Mini-Quizzes
Learning Outcome 12-2
Learning Outcome 12-2
Explain the events of an action potential in cardiac muscle, describe the conducting system of the heart, and identify the electrical events recorded in an electrocardiogram.
Key:
Level 1: Reviewing Facts and Terms
Level 2: Reviewing Concepts
Level 3: Critical Thinking
This activity contains 8 questions.
The cells of the SA or sinoatrial node are electrically connected to those of the larger
node, which is located in the floor of the right atrium near the opening of the coronary sinus. [Level 3]
Label the structural elements in the accompanying illustration of the conducting system. [Level 1]
For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
2.1 AV bundle (or bundle of His)
A
B
C
D
E
2.2 Purkinje fibers
A
B
C
D
E
2.3 AV node (or atrioventricular node)
A
B
C
D
E
2.4 Bundle branches
A
B
C
D
E
2.5 SA node (or sinoatrial node)
A
B
C
D
E
Describe the events that prolong the contraction of a ventricular cell during the plateau of an action potential. [Level 3]
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
In which event of a muscle cell action potential do potassium channels open and K
+
ions rush out of the cell? [Level 2]
stimulus
the plateau
repolarization
refractory period
rapid depolarization
In which ECG phase does ventricular repolarization occur? [Level 1]
P wave
QRS complex
T wave
R wave
Label the events in the accompanying graph of an action potential in a ventricular cardiac muscle cell. [Level 1]
For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
6.1 Repolarization
A
B
C
D
E
6.2 Rapid depolarization
A
B
C
D
E
6.3 Refractory period
A
B
C
D
E
6.4 Stimulus
A
B
C
D
E
6.5 The plateau
A
B
C
D
E
Describe the unusual functions of nodal cells. [Level 3]
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
An action potential is prolonged in a cardiac muscle cell because
continue to enter the cell throughout the plateau. [Level 3]
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