Control of the Heart

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  • Control of the Heart
    • Neural Control
      • The CCC receives info. from the sensory receptors
        • The Mechanoreceptors and the Proprioceptors detect a change in the shape and size of muscles and tendons
          • Info in sent to CCC and there is an increase in CO2 and lactic acid from exercise.
            • The Chemoreceptors detect a change in the pH of the blood
            • This causes the pH to fall and HR to increase.
        • The Chemoreceptors detect a change in the pH of the blood
        • The Baroreceptors are stretch receptors in the walls of the aorta, vena cava and carotid arteries
          • Detecting an increase in blood flow and therefore blood pressure
            • Causes HR to increase
      • Strenuous Exercise
        • DURING - the CCC responds to info from the sympathetic nervous system
          • Causes an increase in HR and Stroke Volume
        • AFTER - the parasympathetic nervous system returns HR to resting
    • Hormonal Control
      • Anticipatory rise in HR due to adrenaline
        • The adrenaline is released by the adrenal gland into the blood during times of stress
        • The adrenaline prepares the body for exercise by increasing HR and the strength of ventricular contraction
          • Adrenaline and Noradrenaline increase HR and respiration rate
            • Constricts blood vessels --> increasing blood pressure, helping blood reach the active muscles
            • Increase blood glucose levels, by stimulating the breakdown of glycogen in the liver which fuels muscular contraction
    • Central to regulation of the heart is the Cardiac Control Centre, it has two main components
      • The Sympathetic Nervous System increases HR
      • The Parasympathetic Nervous System decreases HR
        • Allowing it to return to resting hr
  • DURING - the CCC responds to info from the sympathetic nervous system
    • Causes an increase in HR and Stroke Volume

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