hyperventilation

• hyperventilate?

  removes more CO2 from blood than usual

  • increase time person can hold breath for
• why does blood ph drop following race?

  increased cellular activity/CO2 produced causes higher acidity
• describe events that would causes the body to change in breathing rate after a ph drop in blood

  1. detected by chemoreceptors in carotid/aortic bodies in medulla -> sends nerve impulse to medulla respiratory centre
  2. nerve impulse sent to repiratory muscles
  3. increase contraction of respiratory muscles
• use steady state model to explain why hyperventilate is bad

  stimulus: low CO2 concentration/ decrease H

  receptors: chemoreceptors in aortic arch and carotid bodies. Chemoreceptors in Medulla less stimulated

  Modulator: respiratory centre in medulla less responsive to decreased Co2

  effectors: diaphragm and ICM

  response: stop breath: decrease rate and depth of breath
• use steady state model to explain why hyperventilate is bad

  • stimulus: low CO2 concentration/ decrease H
  • receptors: chemoreceptors in aortic arch and carotid bodies. Chemoreceptors in Medulla less stimulated
  • Modulator: respiratory centre in medulla less responsive to decreased Co2
  • effectors: diaphragm and ICM
  • response: stop breath: decrease rate and depth of breath
• how does breathing in bag help cause breathing back to normal?

  1. expels CO2 into bag
  2. CO2 concentration increase in blood
  3. Chemoreceptors in Medulla more stimulated
  4. Respiratory centre respond by increase rate and depth of breath