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BIOC33H3 (127)
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Study_Guide_for_Lectures_1_to_4_2012.doc

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Department
Biological Sciences
Course
BIOC33H3
Professor
Stephen Reid
Semester
Winter

Description
1BIOC33CC4 Cardiovascular System Lectures 14 Study Guide 2012Lecture 1 Electrical Conduction within the HeartTopicsThe Conduction System of the HeartPacemaker PotentialSample Questions1 What is the pathway of electrical conduction in the heartFrom sa node large cells decrease resistance to av node small cells increase resistance through condution fibres the bundle branches and then purkinje fibres contractile fibres2 Which changes in ionic conductance permeability accompany the various phases of the pacemaker potential3412a In zone 1 a decrease in P and an increase in P In zone 2 an increase in PKNaCab In zone 1 a decrease in P and an increase in P In zone 2 an increase in PKCaNac In zone 3 a large increase in P In zone 4 an increase in P and a decrease in PNaKCad In zone 3 a large increase in P In zone 4 an increase in P and a decrease in PCaKNae A and D3 The action potential that travels along the conduction pathway of the heart moves upward into the ventricles from the apex of the heart via theaAV nodebSA nodec Purkinje FibresdAtrioventricular valvese Bundle of His
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