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Chapter 10 Rhythmical Excitation of the Heart
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Chapter 10 Rhythmical Excitation of the Heart
Complete Chapter Questions And Answers
Sample Questions
1. If the sinus node stops discharging, what is the expected heart rate (in beats/minute) if the A-V node takes over as the cardiac pacemaker?
A. 15
B. 20
C. 35
D. 50
E. 72
ANS: D
2. If the S-A node discharges at 0.00 seconds, when will the action potential normally arrive at the A-V node?
A. 0.03 seconds
B. 0.09 seconds
C. 0.12 seconds
D. 0.16 seconds
E. 0.80 seconds
ANS: A
3. Which of the following conditions at the S-A node will cause a decrease in heart rate?
A. Increased sodium permeability
B. Decreased acetylcholine levels
C. Increased norepinephrine levels
D. Increased potassium permeability
E. Increased calcium permeability
ANS: D
4. In which phase of the ventricular muscle action potential is the potassium permeability the highest?
A. 0
B. 1
C. 2
D. 3
E. 4
ANS: D
5. If the S-A node discharges at 0.00 seconds, when will the action potential normally arrive at the A-V bundle?
A. 0.80 seconds
B. 0.16 seconds
C. 0.12 seconds
D. 0.09 seconds
E. 0.03 seconds
ANS: C
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