Factors of Regulating Heart Rate

  • Created by: cara12
  • Created on: 13-04-19 14:31
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  • Factors Regulating Heart Rate
    • Neural
      • vasomotor centre responds to changes detected by :  Barroreceptors,Chemoreceptors,Proprioreceptors
      • Barroreceptors:Sensors detecting changes in blood pressure
      • Chemoreceptors:Sensors detecting chemical changes within the blood
      • Proprireceptors:Detect the changes in body position
      • Receptors send an impulse to cardiac control centre in the medulla oblongata which sends an impulse to the SA node either via:
        • Parasympathetic nervous system(vagas nerve)to slow heart rate
        • Sympathetic nervous system(acceleratory nerve)to increase heart rate
    • Hormonal
      • Adrenaline and noradrenaline released from adrenal glands.
      • Adrenaline is released into the bloodstream,and stimulates the adrenergic receptors and SA node found in the heart,increasing HR.
      • Release of adrenaline before exercise is known as the anticipatory rise
    • Intrinsic
      • Higher temperature caused through exercising causes increased HR as heart works harder to get blood to the skin so heat can be lost
      • It also concerns the venous return mechanism
    • Venous return
      • The rate at which blood returns to the heart
      • Intensity increases: Blood redistribution needs to be quicker otherwise cardiac output decreases
        • Exercise increases it through the muscle pump and respiratory pump which forces blood back to the heart
          • This process is also aided by pocket valves in the veins,smooth muscle in the walls of the blood vessels and gravity
      • During recovery:Lower VR results in a lower SV.Due to reduced stretching of the ventricles with a low VR(Frank-Starling law)

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