2024-02-13T18:44:10+03:00[Europe/Moscow] en true <p>Unstimulated ___________ ____ of the heart maintain a stable resting membrane potential&nbsp;</p><p>Autorhythmic ____________ ____ that depolarize spontaneously are part of the<em> intrinsic cardiac conduction system&nbsp;</em>they have an ___________ resting potential that<em> continuously </em>depolarizes toward the threshold</p>, <p><strong>1. Pacemaker potential</strong></p><p>Ion channels in the _____________ have special properties&nbsp;</p><p>_______________ at the end of the action potential <em>both </em>_________ ____________ __________ and _______ ______ ________ __________ the sodium influx causes membrane interior to become _______ _________</p>, <p><strong>2. Depolarization&nbsp;</strong></p><p>Threshold at ______ causes _________ _________ to open allowing for explosive entry of calcium from extracellular space, this causes ___________ _____ to reverse their __________ _________ due to the influx of calcium</p>, <p><strong>3. Repolarization</strong></p><p>___________ _________ inactivate the falling phase of the action potential happens due to ________ __________ __________</p>, <p>Once repolarization is complete, _________ ___________ ______, and the ____________ _____ slowly depolarize again</p>, <p>state the sequence of excitation</p><p>1.</p><p>2.</p><p>3.</p><p>4.</p><p>5.</p> flashcards
intrinsic cardiac conduction system

intrinsic cardiac conduction system

  • Unstimulated ___________ ____ of the heart maintain a stable resting membrane potential 

    Autorhythmic ____________ ____ that depolarize spontaneously are part of the intrinsic cardiac conduction system they have an ___________ resting potential that continuously depolarizes toward the threshold

    contractile cells

    stable

    pacemaker cells

    unstable

    depolarize

  • 1. Pacemaker potential

    Ion channels in the _____________ have special properties 

    _______________ at the end of the action potential both _________ ____________ __________ and _______ ______ ________ __________ the sodium influx causes membrane interior to become _______ _________

    sarcolemma

    hyperpolarization

    closes potassium channels

    opens slow sodium channels

    less negative

  • 2. Depolarization 

    Threshold at ______ causes _________ _________ to open allowing for explosive entry of calcium from extracellular space, this causes ___________ _____ to reverse their __________ _________ due to the influx of calcium

    -40mV

    calcium channels

    pacemaker cells

    membrane potentials

  • 3. Repolarization

    ___________ _________ inactivate the falling phase of the action potential happens due to ________ __________ __________

    calcium channels

    open potassium channels

  • Once repolarization is complete, _________ ___________ ______, and the ____________ _____ slowly depolarize again

    potassium channels close

    pacemaker cells

  • state the sequence of excitation

    1.

    2.

    3.

    4.

    5.

    sinoatrial node

    atrioventricular node

    atrioventricular bundle

    right and left bundle branches

    subendocardial conducting network