Action potential of cardiac muscle and SA Node - Usmle step 1 CVS Physiology

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Cardiovascular physiology - Action potential of cardiac muscle and SA Node , medical animations
Pacemaker cells (e.g., sinus node) of the conduction system of the heart autonomously and spontaneously generate an action potential that spreads throughout the myocardium.
The electrical excitation of the myocardium results in its contraction (electromechanical coupling).
The phase of relaxation prevents immediate re-excitation (refractory period).
Conducting system of the heart
----------------------------------------------------
See structures of cardiac conduction system: collection of nodes and specialized myocytes that initiate and coordinate contraction of the heart muscle
Normal course of electrical conduction: sinus node (pacemaker) creates an action potential → signal spreads across atria and causes their contraction → signal reaches AV node and is slowed down → AV node conducts the signal to bundle of His down the interventricular septum to Purkinje fibers in myocardium → they spread the signal across the ventricles → the ventricles contract (electromechanical coupling)
#cvsphysiology #physiology #cardiovascularphysiology #usmlephysiology #usmle #usmlestep1 #medicalphysiology #actionpotentialofcardiacmuscle #actionpotentialofsanode #physiologyanimations #fmge #neetpg #snnode #avnode #cardiacmusclephysiology #cvsusmle #cvsphysiologyusmle

[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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Hats off Sir!
Huge respect from Pakistan 🇵🇰 ❤️

[@doctorbhanuprakash]

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Excellent and simple presentation with high quality animation

[@neethu9981]

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[@vijayrajmanjeti4526]

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[@doctorbhanuprakash]

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[@anjanas.krishnan8763]

Nice explanation sir. Mainly, explanation regarding action potential of heart is amazing.

[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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Amazing explanation sir. thank you sir.

[@doctorbhanuprakash]

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Super way to deliver about to SA node

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What happens to refractory period in fibrillations?

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

Keep watching

[@kirtirajkashyap9026]

Thank you sir for detailed explanation.
Sir, I have a doubt........during slow action potential of SA node, Ca ion influx which causes depolarisation, But how this large amount of Ca ion get back to extra cellular fluid ?

[@mbbshub2589]

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[@doctorbhanuprakash]

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[@doctorbhanuprakash]

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[@gure1686]

Respected sir ,
I want to say that sir last i had tacharcardia episode 16 july 2021 , undocumented 192 heart rate measured by oximeter , i had dizziness , palpitations these all syptoms but i had totaly awareness that time , before this episode i had diagnosed as hypochondria by psychatrist in 2018 , i prescribed medicine for six months , but i had anxiety attacks some times , before episode on that day i have cardic neurosis that i had heart attack and i took atenlol beta blocker but then suddenely this tachardia episode happened, so after that i took many psychotherapy from psychologist and my anxiety reduced but i went to cardiologist he diagnosed me AvNRT , he said to me that during panic attack or sinus tacharcardia could not exceed 160 heart rate so its definitely svt episode? So there is any possibility sinus tacharcardia to reach 192 heart rate ? My birth date 16/04/1986. After that i have never tachardia episode happen, so but you would said about this .i shall be very thankful to you if you replied me 🙏.
Your sincerely
Gurmeet singh

[@litondas7646]

Nice

[@doctorbhanuprakash]

Thanks

[@mbbshub2589]

Why SA nodal fibers are slow and myocardial fibers are fast???

[@medway6669]

Wait.... Won't it be like base of heart gets repolarised first and then the bundle at atrioventricular septum?

[@mbbshub2589]

Why RMP is due to K+ in cardiac muscle??

[@znsbiologyneetking]

Super 100

[@neelakandand1042]

sir i want to see the sa node stucture

[@anasak369]

good one...sir did nt mention anything about threshold in action potential?

[@doctorbhanuprakash]

threshold will be thr in sa.nodal action potential but not in cardiac muscle action potential

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[@doctorbhanuprakash]

sure many gonna be added , thank u

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I'm Irish...up India..

[@meenakshisakthi5747]

Ligand gated channels... pls teach about it sir

[@lucifer-bq3hp]

Sir sa node n av node heart ko chalata hai( power deta hai) but sa node or av node ko enargy (power) kahain se milati.. hai

[@lucifer-bq3hp]

Plz explain what is the energy source of SA node..

[@MedBees]

For our body initial source is oxygen. While aerobic respiration supports normal heart activity, anaerobic respiration may provide additional energy during brief periods of oxygen deprivation. And oxygen is supplied by CORONARY ARTERIES.

[@HamzaKhan-nu5rw]

17:22 sa node starts