cardiovasular system- physiological action

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  • Created by: anna888
  • Created on: 14-12-22 16:07
role of sa node
pacemaker, autorhythmic tissue, passes action pot to av and atria
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av node role
conducts ap slowly to esnure ventricle sand atrias contacting sepreatly
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purkenjee fibers role
conduct ap to ventriculer myocytes
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describe impulse pathway over heart
sa impulse- atria contacts- pause when reaches av- goes to left and right bundles- conducts to purkenjee- venticular contraction
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dsecribe action potenital in non pacemaker cells
na ion chanles opne, depolariation. if thershold met, na innnactivated and l tpe ca chanles and k chnales opne simulatneouly . k goes out ca in. platueau as ion balance. contraction. ca chanles innctive. k stay open as it repolarises
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describe contaction mechanism
ca binds to tnc on actin. exposes binding sites. acto mysoin brideg form with myosin heads. ratchting of bridge. shorting of sarcomere. ca dissoiates from tnc. myosin unbinds from actin using atp energy
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describe calcium and L type chanel
ca enetrs via l type chanel. cicr ocurs from sacro ret. then reabsorbed via serca and used na/ca ion exchanger and ca atp depndant exhnager to remove from cell
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decsribe action potenial in non pacemaker cells
no true resting potential. spontaneous depol involving na inward and k out. depol means threshold met and ca enters via l type chanels. repol as ca chanels innactivated and k chanels stay open
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how does parasymp control cardiac cycle
vagus nerve as center, branches to sa and av. sceretes ACh to hyperpolarise heart and decrease hr
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how does symp control cardiac cycle
cardiac nerves as center, secrtes norepinephrine, increasses contraction force
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what does each each letter represent in ecg (P, QRS, T)
p= depol of atria. qrs= ventricular depol t= repol ventricles
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what does pr and qt interval represent
pr= start of atrial depol- start of ventricular depol qt= time for ventricles to start depol and start repol
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desribe ischaemic heart disease
heart not supplied with blood- heart attack
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describe cardiac disrhymais
distruption of contraction control-cardiac arrest
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describe cardiac failure
inability of heart to supply blood around body- heart failure
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Other cards in this set

Card 2

Front

av node role

Back

conducts ap slowly to esnure ventricle sand atrias contacting sepreatly

Card 3

Front

purkenjee fibers role

Back

Preview of the front of card 3

Card 4

Front

describe impulse pathway over heart

Back

Preview of the front of card 4

Card 5

Front

dsecribe action potenital in non pacemaker cells

Back

Preview of the front of card 5
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