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Cardiac Conduction - Unit 2 Quiz - Physiology

Questions and Answers

1.

The initial phase of the action potential, associated with the rapid opening of sodium channels, is called:
- A.
  
  Plateau
- B.
  
  Initiation
- C.
  
  Depolarization
- D.
  
  Repolarization
Correct Answer
C. Depolarization
2.

When ____ concentration rises inside the contractile fiber, contraction of the muscle occurs.
- A.
  
  Potassium
- B.
  
  Sodium
- C.
  
  Chloride
- D.
  
  Calcium
Correct Answer
D. Calcium
3.

The term that refers to the period when another contraction cannot occur in the muscle is:
- A.
  
  Depolarization
- B.
  
  Tetanus
- C.
  
  Refractory
- D.
  
  Autorhythmic
Correct Answer
C. Refractory
4.

All of the following are true about repolarization, EXCEPT:
- A.
  
  Membrane potential returns to resting potential
- B.
  
  Is associated with potassium outflow
- C.
  
  Occurs before the plateau phase of the action potential
Correct Answer
C. Occurs before the plateau phase of the action potential
5.

The long refractory period characteristic of cardiac muscle contributes to all of the following, EXCEPT:
- A.
  
  Tetanus (sustained muscle contraction)
- B.
  
  Allows cardiac muscle to relax before contracting again
- C.
  
  Allows ventricles to fill with blood during relaxation
- D.
  
  Promotes effective blood flow
Correct Answer
A. Tetanus (sustained muscle contraction)
6.

The normal path of impulse conduction in the heart is:
- A.
  
  SA node-Purkinje fibers-AV node-AV bundle-bundle branches
- B.
  
  SA node-AV node-Purkinje fibers-AV bundle-bundle branches
- C.
  
  SA node-AV node-bundle branches-AV bundle-Purkinje fibers
- D.
  
  SA node-AV node-AV bundle-bundle branches-Purkinje fibers
Correct Answer
D. SA node-AV node-AV bundle-bundle branches-Purkinje fibers

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Current Version
Jan 29, 2013

Quiz Edited by
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Sep 11, 2011

Quiz Created by
Bushpeggy

Physiology Quiz

The initial phase of the action potential, associated with the rapid opening of sodium channels, is called:

When ____ concentration rises inside the contractile fiber, contraction of the muscle occurs.

The term that refers to the period when another contraction cannot occur in the muscle is:

All of the following are true about repolarization, EXCEPT:

The long refractory period characteristic of cardiac muscle contributes to all of the following, EXCEPT:

The normal path of impulse conduction in the heart is: