Controlling heart rate

• 1. Centre that increases heart rate
  2. sympathetic nerve that increases heart rate
  3. parasympathetic nerve that decreases heart rate
  4. SAN
  5. AV node
  6. centre that decreases the heart rate
  7. cartoid artery
  8. pressure and chemo receptors

  
• What is heart rate

  An involuntary and controlled by autonomic nervous system
• What part of the brain is responsible for controlling the heart rate

  The medulla oblongata
• How does a centre in the brain increase heart rate

  sends impulses through the sympathetic nervous system transmitted by the accelerator nerve
• How does a centre in the brain decrease the heart rate

  Sending impulses through the parasympathetic nervous system transmitted by the vagus nerve
• What is a baroreceptor

  Pressure receptors that detect changes in blood pressure
• What is a chemoreceptor

  A chemical receptor that detects changes in the in chemicals
• how does adrenaline and noradrenaline affect heart rate

  They affects the pace maker region of the heart by speeding up your heart rate by increasing the frequency of impulse produced by the SAN
• How do chemoreceptors work

  1. Increased muscular activity
  2. more carbon dioxide produced
  3. blood pH is lowered
  4. centre in medulla oblangata that speeds up heart rate increases frequency of impulses to SAN via sympathetic nervous system
  5. SAN increases heart rate
  6. increases blood flow to remove carbon dioxide faster
  7. carbon dioxide levels return to normal