Control of heart beat Please hand in your homework
What is wrong?
Starter question 1 square = 1mm
<ul><li>Cardiac muscle is myogenic </li></ul><ul><li>It does not need nerve impulses to contract </li></ul><ul><li>These c...
SAN <ul><li>Sino atrial node </li></ul><ul><li>Small patch of muscle in right atrium wall </li></ul><ul><li>Pacemaker </li...
<ul><li>Both atria contract together </li></ul><ul><li>The excitation wave is briefly delayed by a bunch of fibres which d...
AVN <ul><li>Atrio ventricular node </li></ul><ul><li>Small patch of conducting fibres high up in septum </li></ul><ul><li>...
Purkyne tissue <ul><li>Fibres in septum </li></ul><ul><li>Cause contractions in ventricle walls from bottom up </li></ul><...
Diagram of heart showing SAN, AVN and purkyne tissue
Summary diagram
Blood vessels <ul><li>We will examine and draw some prepared slides </li></ul><ul><li>Extension – if you would like to exa...
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Control Of Heart Beat

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Control Of Heart Beat

  1. 1. Control of heart beat Please hand in your homework
  2. 2. What is wrong?
  3. 3. Starter question 1 square = 1mm
  4. 4. <ul><li>Cardiac muscle is myogenic </li></ul><ul><li>It does not need nerve impulses to contract </li></ul><ul><li>These contractions must be controlled so that cells work in unison </li></ul>
  5. 5. SAN <ul><li>Sino atrial node </li></ul><ul><li>Small patch of muscle in right atrium wall </li></ul><ul><li>Pacemaker </li></ul><ul><li>Their contractions spread a wave of electrical activity in the atrial walls </li></ul><ul><li>Cardiac muscle responds, making the atria contract in time with the SAN </li></ul>
  6. 6. <ul><li>Both atria contract together </li></ul><ul><li>The excitation wave is briefly delayed by a bunch of fibres which do not conduct the electrical activity </li></ul><ul><li>This delay is to ensure that the ventricles contract after the atria </li></ul>
  7. 7. AVN <ul><li>Atrio ventricular node </li></ul><ul><li>Small patch of conducting fibres high up in septum </li></ul><ul><li>Allows the electrical activity to spread slowly from the atria to the ventricles </li></ul><ul><li>Passes on to the purkyne tissue </li></ul>
  8. 8. Purkyne tissue <ul><li>Fibres in septum </li></ul><ul><li>Cause contractions in ventricle walls from bottom up </li></ul><ul><li>Squeezing blood upwards </li></ul>
  9. 9. Diagram of heart showing SAN, AVN and purkyne tissue
  10. 10. Summary diagram
  11. 11. Blood vessels <ul><li>We will examine and draw some prepared slides </li></ul><ul><li>Extension – if you would like to examine your own blood under the microscope you may do so, using a lancet </li></ul><ul><li>Homework to hand in next thurs– read about the 3 types of blood vessels – make a labelled diagram of each and describe the differences. </li></ul>
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