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WorksheetsCardiac electrophysiology
Total questions: 10
Worksheet time: 10mins
Which is the correct path of electrical impulses through the heart?
SA node - Purkinje fibers - AV node - AV bundle - bundle branches
SA node - AV node - Purkinje fibers - AV bundle - bundle branches
SA node - AV node - bundle branches - AV bundle - Purkinje fibers
SA node - AV node - AV bundle - bundle branches - Purkinje fibers
What is going on in the heart during the R-wave or QRS complex
AV node triggers depolarization in ventricle, the main pumping action
Delay caused by the SA node
Repolarization of the ventricle
SA node triggers depolarization in atria
The main function of the cardiac conduction pathway is:
To ensure that the heart muscle in the atria and ventricles all contracts at the same time
To increase and decrease the heart rate in response to exercise
To ensure coordinated muscle contraction in the chambers and effective pumping of blood
None of the above
What are the main components of the cardiac conduction system?
SA node, AV node, AV bundle, bundle branches & Purkinje fibers
Atria and ventricles (left and right), SA node, AV node, AV bundle, bundle branches & Purkinje fibers
Aorta, superior and inferior vena cava, pulmonary trunk
All of the above
All of the following are true about repolarization, EXCEPT
Is associated with potassium outflow
Occurs before the plateau phase of the action potential
Membrane potential returns to resting potential (-90 mV)
The term that refers to the period when another contraction cannot occur in the muscle is:
Autorhythmic
Depolarization
Refractory
Hyperpolarisation
Action potentials in neurons are the same in muscle cells.
True
False
There is more than one type of action potential used in the heart.
True
False
Which of these is not a model that explains heart rate?
Polarity model
Slope model
Contraction model
What is the function of the AV node?
Limits fibrillation entry into ventricles
Delays action potentials to allow ventricular filling (functions as a relay-station)
Serves as a secondary pacemaker
All of the above
