respiratory responses

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  • Created by: z_mills1
  • Created on: 05-06-14 14:04
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  • Respiratory responses
    • 'anticipatory rise' is the minor rise in breathing rate before exercise begins
    • when exercise begins there is an immediate and significant increase in breathing rate
    • this is the result of receptors e.g. chemoreceptors working in both muscles and joints
    • when exercising, nerve impulses send a signal to the respiratory centre in the medulla oblongata and muscles are recruited to support the breathing process
    • muscles demand more oxygen after changes in exercise intensity
    • carbon dioxide increase as a result of increased energy production - results in an increase in acidity of the blood
    • breathing rate increases to satisfy these demands
    • capillary network (surrounding alveoli) expands
      • results in increased blood flow to the lungs and increased pulmonary diffusion


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