AP 6
Quiz <ul><li>1. Name the 3 layers of the heart </li></ul><ul><li>2. What is the name of the heart’s natural pacemaker? </l...
 
Cardiac pacemaker <ul><li>SA node: heart’s pacemaker </li></ul><ul><li>Action potential = nerve impulse (signal) </li></ul>
<ul><li>Threshold: voltage inside nerve cells, above which an impulse will be triggered </li></ul><ul><li>Depolarization: ...
 
What depolarizes the SA node? <ul><li>1. decreased outward flow of K+ </li></ul><ul><li>2.increased influx (inward flow) o...
HW <ul><li>1. Read p. 291 – 294 </li></ul><ul><li>2. Review 283-288 </li></ul><ul><li>(ignore box on fetal circulation) </...
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Ap6

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Ap6

  1. 1. AP 6
  2. 2. Quiz <ul><li>1. Name the 3 layers of the heart </li></ul><ul><li>2. What is the name of the heart’s natural pacemaker? </li></ul><ul><li>3. Place the following in the correct order, from beginning of electrical signal to ventricular contraction: </li></ul><ul><li>A) bundle of His b) AV node c) SA node d) Purkinje fibers </li></ul><ul><li>4.Name 3 ions found in the human body </li></ul>
  3. 4. Cardiac pacemaker <ul><li>SA node: heart’s pacemaker </li></ul><ul><li>Action potential = nerve impulse (signal) </li></ul>
  4. 5. <ul><li>Threshold: voltage inside nerve cells, above which an impulse will be triggered </li></ul><ul><li>Depolarization: the inside of the nerve cell is becoming less negatively charged </li></ul>
  5. 7. What depolarizes the SA node? <ul><li>1. decreased outward flow of K+ </li></ul><ul><li>2.increased influx (inward flow) of Ca 2+ </li></ul><ul><li>3. A constant, slow influx of Na+ </li></ul>
  6. 8. HW <ul><li>1. Read p. 291 – 294 </li></ul><ul><li>2. Review 283-288 </li></ul><ul><li>(ignore box on fetal circulation) </li></ul>

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