Physiology Quiz - Cardiac Conduction

6 Questions | By CardioECI517 | Last updated: Mar 21, 2022 | Total Attempts: 1293

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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
2.

When ___ concentration rises inside the contractile fiber, contraction of the muscle occurs.
- A.
  
  Potassium
- B.
  
  Sodium
- C.
  
  Chloride
- 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
4.

All of the following are true about repolarization, EXCEPT:
- A.
  
  Membrane potential returns to resting potential (-90 mV)
- B.
  
  Is associated with potassium outflow
- 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 to the body
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

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