CVS: excitability Flashcards
what are non pacemaker cells and what is their role? where are they found >
what are pacemaker cells, what is their role, and where are they found
what are funny current channels? what is their role
describe the action of pacemakers and funny channels during an ap
what is the role of na in non pacemaker cells
what is the role of na in pacemaker cells
what is the role of ca in non pacemaker cells
what is the role of ca in pacemaker cells
how do autorhythmic signals reach muscle cells
where is the intrinsic conduction system? what can these cells do wrt aps
describe the structures in order the the intrinsic conduction system
describe the passage of electrical signals through the heart
describe the steps of electrical conduction in the heart and how it relates to contraction
what is the sa node and what does it do
what is the av node and what does it do
why are conductive fibers sheathed
why are atrial and ventricular myocyte syncitia separated
where do symp nerves act on the heart? where do parasymp nerves act on the heart?
describe symp action of epi and NE on the heart
scribe parasymp action of ach on the heart
how does parasymp activity lower heart rate
what does atropine do
what proteins get activated and inactvated under parasymp signalling in the heart
what is the role of the symp system on the heart
how is the symp system stimulated
describe protein signalling in symp system on heart
what happens wrt depol in parasymp activation of heart? why?
what happens wrt depol during symp action on heart? why?
which nerves can decrease heart rate?
why cant parasymp change force of contraction>
how can symp fibers increase rate and force of contraction
how does the ecg
what are the three waves of an ecg
what does the p wave represent
what does the pq or pr segment line up with
what happens during q wave
what happens during the r wave
what happens during s wave
what happens during the t wave
why is the ecg and myocardial ap different
what does a normal ecg look like
how could you identify complete block on an ecg
how could you idenity artial fibrulation on an ecg
how could you identify ventricular fibrulation on ecg
how can you identify second degree heart block on ecg
