Electrocardiograms
Membrane Potential Is this membrane polarized or depolarized? A polarized membrane has an imbalance of positive and negati...
Medulla Oblongata The  medulla oblongata  is a part of the brain stem that controls  heart  activity
SA and AV nodes SA node AV node AV bundle Left and right bundle branches Purkinjie fibres
ECG <ul><li>Electrocardiogram </li></ul>
P Wave <ul><li>Contraction of the  atria </li></ul><ul><li>Polarized membrane becomes depolarized (even out) using channel...
QRS Complex <ul><li>Contraction of the  ventricles </li></ul><ul><li>Signals travels down septum around ventricles ( depol...
T wave <ul><li>Ventricles  relax </li></ul><ul><li>Membrane  repolarizes </li></ul>
<ul><li>Within the heart there is an area of  nerve cells  known as the pacemaker ( sinuatrial node) , which is situated i...
<ul><li>The electrical impulse is picked up by a further electrical node called the  atrioventricular node , which is situ...
<ul><li>The atrioventricular node then sends an impulse  down the central wall  of the heart (called the septum), between ...
<ul><li>It is the passage of this electric conduction from the top of the heart over the atria through the septum and vent...
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05 ecg 2011

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  • http://www.youtube.com/watch?v=te_SY3MeWys&amp;NR=1 Membrane potential http://www.youtube.com/watch?v=iA-Gdkje6pg&amp;feature=related
  • 05 ecg 2011

    1. 1. Electrocardiograms
    2. 2. Membrane Potential Is this membrane polarized or depolarized? A polarized membrane has an imbalance of positive and negative ions on each side. Depolarization enables a signal to be sent along the length of a neuron Polarized
    3. 3. Medulla Oblongata The medulla oblongata is a part of the brain stem that controls heart activity
    4. 4. SA and AV nodes SA node AV node AV bundle Left and right bundle branches Purkinjie fibres
    5. 5. ECG <ul><li>Electrocardiogram </li></ul>
    6. 6. P Wave <ul><li>Contraction of the atria </li></ul><ul><li>Polarized membrane becomes depolarized (even out) using channels. </li></ul><ul><li>depolarization occurs from the SA-AV node. Signals atria to contract. </li></ul>
    7. 7. QRS Complex <ul><li>Contraction of the ventricles </li></ul><ul><li>Signals travels down septum around ventricles ( depolarization of ventricles). </li></ul><ul><li>While the ventricles are depolarizing , the atria are repolarizing (at the same time) </li></ul><ul><li>QRS is actually both but you can’t differentiate the signals because the atria repolarizing is smaller. </li></ul>
    8. 8. T wave <ul><li>Ventricles relax </li></ul><ul><li>Membrane repolarizes </li></ul>
    9. 9. <ul><li>Within the heart there is an area of nerve cells known as the pacemaker ( sinuatrial node) , which is situated in the upper wall of the right atrium. </li></ul><ul><li>The sinuatrial node initiates an impulse, which flows over the two upper chambers of the heart, the right and left atrium. </li></ul>Process: Part I
    10. 10. <ul><li>The electrical impulse is picked up by a further electrical node called the atrioventricular node , which is situated in the lower part of the right atrium close to the valves between the upper and lower chambers of the heart. </li></ul>Process: Part II
    11. 11. <ul><li>The atrioventricular node then sends an impulse down the central wall of the heart (called the septum), between the two ventricles and into the left and right bundle branches via the electrical conductive tissue to carry the impulse over each of the ventricles. </li></ul>Process: Part III
    12. 12. <ul><li>It is the passage of this electric conduction from the top of the heart over the atria through the septum and ventricles that causes the muscle to contract , the valves to open and close and blood to empty into the lungs from the right side of the heart then back into the left side of the heart and around the body. </li></ul>Process: Part IV

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