6.1.3 Control of heart rate

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Last updated 10:23 AM on 4/22/26
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6 Terms

1
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Cardiac muscle is myogenic. What does this mean?

It can contract and relax without recieving electrical impulses from nerves.

2
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Where are the sinoatrial node, atrioventricular node, Bundle of HIS and purkyne tissue in the heart?

3
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Describe the myogenic stimulation of the heart and transmission of a subsequent wave of electrical activity

  1. sinoatrial node cts as a pace maker → releases regular waves of electical activity across atria

    • causes atria to contract simulataneously

  2. non-conducting tissue between atria / ventricles prevents impulse from passing directly into the ventricles

    • preventing immediate contraction of ventricles

  3. waves of electrical activity reach atrioventricular node which delays impulse

    • allowing atria to fully contract and empty before ventricles contract

  4. atrioventricular node sends wave of electrical activity down bundle of His, conducting wave between ventricles to apex where it branches into purkyne tissue

    • causing ventricles to contract from the bottom up, simultaneously

4
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Where are chemoreceptors and pressure receptors located?

chemoreceptors and pressure receptors are located in the aorta and carotid arteries

5
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Dewscribe the roles of pressure receptors, the autonomic nervous system and effectors in controlling the heart rate

  • barroreceptors detect ( fall / rise ) in the blood pressure

  • send impulses to medulla

  • which send more frequent impulses to SAN along the ( sympathetic / parasympathetic ) neurones

  • so ( more / less ) frequent impulses sent from SAN and to or from AVN

  • so cardiac muscle contracts ( more / less)

  • so ehart rate (increases / decreases )

6
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Dewscribe the roles of chemoreceptors, the autonomic nervous system and effectors in controlling the heart rate

  • chemoreceptors detect ( rise / fall ) in blood CO2 conc. or ( fall / rise ) in blood pH

  • send impulses to medulla

  • which send more frequent impulses to SAN along the ( sympathetic / parasympathetic ) neurones

  • so ( more / less ) frequent impulses sent from SAN and to or from AVN

  • so cardiac muscle contracts ( more / less)

  • so ehart rate (increases / decreases )