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Cardiac Physiology

Sequence of Excitation

QuestionAnswer
How is the Heart excited? Automaticity from Non-Contractile Fibers: Pacemaker and conductiong system cells
What is the path of Excitation through the Heart? SA Node --> AV Node -->His Bundle --> Purkinje Fibers
What is t eh function of Cardiac Excitation? produce spontaneous DEPOLARIZATION forming regular Cardiac APs
What is another name for Cardiac APs? Pacemaker Potentials
Where is the Sinoatrial Node located? upper RIGHT Atrium
What is the function of the SA Node? intiates wave of Excitation spread --> R & L Atria via Intercalated Discs
Which Atrium contracts first? both Atria contract SIMULTANEOUSLY
Where is the Atrioventricular Node located? floor of R Atrium
What is the function of the VA Node? receives DEPOLARIZATION from Atrial cells; praopagates dep. via His Bundle and Purkinje Fibers --> contractile cells
What is the purpose for the .1 sec SA-VA Transmission Delay? time for Ventricles to fill with Blood
Whcich Ventricle contracts first? both Ventricles contract SIMULTANEOUSLY
Created by: Kristel
 

 



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