6.1.3 Control of heart rate

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5 Terms

1
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Cardiac muscle is myogenic. What does this mean?

It can contract and relax without receiving electrical impulses from nerves

2
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<p><strong>Label the SAN, AVN, Bundle of His and Purkyne tissue on a diagram of the heart</strong></p>

Label the SAN, AVN, Bundle of His and Purkyne tissue on a diagram of the heart

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Where are Chemoreceptors and Baroreceptors located?

Aorta and carotid arteries

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Describe the control of heart rate - Low bp/ Low pH

  1. Increases CO2 conc. in blood/ decreases in bp

  2. Detected by Chemo/ Baroreceptors

  3. Acceleratory centre in medulla sends impulses by sympathetic neurone

  4. SAN stimulated by Noradrenalin

  5. Increased frequency of wave of electrical impulses to AVN

  6. Cardiac muscle contracts more frequently

  7. Heart rate increases

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Describe the control of heart rate - High bp/ High pH

  1. Decreased CO2 conc. in blood/ increased bp

  2. Detected by Chemo/ Baroreceptors

  3. Inhibitory centre in medulla sends impulses by parasympathetic neurone

  4. SAN stimulated by acetylcholine (ACh)

  5. Reduced frequency of waves of electrical impulses to AVN

  6. Cardiac muscle contracts less frequently

  7. So heart rate decreases