cardiac action potentials Flashcards
what is the cardiac action potential?
when one cell depolarises, what helps transmit the depolarisation to other cells?
gap junctions
what is phase 4 of action potential?
what is phase 0 of action potential?
which class of anti arrhythmic drugs acts on phase 1 and what do they do?
what is phase 1 of action potential?
what is phase 2 of action potential?
which class of anti arrhythmic drugs acts on phase 2 and what do they do?
what is phase 3 of action potential?
which class of anti arrhythmic drugs acts on phase 3 and what do they do?
how does myocyte vary to skeletal muscle action potential?
what is the refractory period?
where can myocyte action potential be found?
Bundle of HIS, bundle branches, purkinje fibres, atrial + ventricular myocytes
what action potential is found in the SA and AV nodes?
pacemaker action potential
describe the pacemaker action potential
what is automaticity and no fast Na+ channel activity in pacemaker cells?
what are the effects of drugs that act on pacemaker cells in Sa and AV nodes?
what are the drugs that block pacemaker potential?
how do verapamil/diltiazem work?
SLOW PHASE 0
how do B blockers work?
prolong repolarisation, slow AV node conduction
what modifies HR by modifying slope of phase 4?
what are the pacemakers in the heart?
