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Cardiac Physiology
Sequence of Excitation
Question | Answer |
---|---|
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 |