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PSL301 > CVS: excitability > Flashcards

CVS: excitability Flashcards

1
Q

what are non pacemaker cells and what is their role? where are they found >

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2
Q

what are pacemaker cells, what is their role, and where are they found

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3
Q

what are funny current channels? what is their role

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4
Q

describe the action of pacemakers and funny channels during an ap

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5
Q

what is the role of na in non pacemaker cells

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6
Q

what is the role of na in pacemaker cells

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7
Q

what is the role of ca in non pacemaker cells

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8
Q

what is the role of ca in pacemaker cells

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9
Q

how do autorhythmic signals reach muscle cells

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10
Q

where is the intrinsic conduction system? what can these cells do wrt aps

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11
Q

describe the structures in order the the intrinsic conduction system

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12
Q

describe the passage of electrical signals through the heart

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13
Q

describe the steps of electrical conduction in the heart and how it relates to contraction

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14
Q

what is the sa node and what does it do

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15
Q

what is the av node and what does it do

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16
Q

why are conductive fibers sheathed

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17
Q

why are atrial and ventricular myocyte syncitia separated

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18
Q

where do symp nerves act on the heart? where do parasymp nerves act on the heart?

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19
Q

describe symp action of epi and NE on the heart

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20
Q

scribe parasymp action of ach on the heart

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21
Q

how does parasymp activity lower heart rate

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22
Q

what does atropine do

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23
Q

what proteins get activated and inactvated under parasymp signalling in the heart

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24
Q

what is the role of the symp system on the heart

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25
Q

how is the symp system stimulated

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26
Q

describe protein signalling in symp system on heart

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27
Q

what happens wrt depol in parasymp activation of heart? why?

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28
Q

what happens wrt depol during symp action on heart? why?

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29
Q

which nerves can decrease heart rate?

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30
Q

why cant parasymp change force of contraction>

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31
Q

how can symp fibers increase rate and force of contraction

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32
Q

how does the ecg

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33
Q

what are the three waves of an ecg

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34
Q

what does the p wave represent

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35
Q

what does the pq or pr segment line up with

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36
Q

what happens during q wave

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37
Q

what happens during the r wave

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38
Q

what happens during s wave

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39
Q

what happens during the t wave

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40
Q

why is the ecg and myocardial ap different

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41
Q

what does a normal ecg look like

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42
Q

how could you identify complete block on an ecg

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43
Q

how could you idenity artial fibrulation on an ecg

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44
Q

how could you identify ventricular fibrulation on ecg

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45
Q

how can you identify second degree heart block on ecg

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PSL301 (32 decks)

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