CHEMORECEPTORS

• WHERE ARE CHEMORECEPTORS FOUND?

  in carotid artery walls
• WHAT ARE CHEMORECEPTORS SENSITIVE TO?

  blood pH changes
• CONTROL BY CHEMORECEPTORS?

  1. Blood has higher CO2 concentration than normal
  2. Blood pH decreases
  3. Chemoreceptors detect this and increase nervous impulse frequency to centre in medulla oblongata that increases heart rate
  4. Increases impulse frequency via sympathetic nervous system to SAN
  5. Increases electrical waves production rate by SAN
  6. Heart rate increases
  7. Increased blood flow
  8. More CO2 removed by lungs
  9. CO2 concentration (+ blood pH) returns to normal
  10. Chemoreceptors reduce frequency of nerve impulses to medulla oblongata
  11. Decreases frequency of impulses to SAN
  12. Heart rate decreases