Describe how lung ventilation and heart rate can be increased or decreases

Describe how lung ventilation and heart rate can be increased or decreases

Describe how lung ventilation and heart rate can be increased or decreases

  • increased tissue respiration causes accumulation of carbon dioxides and depletion of oxygen
  • the high carbon dioxide content in blood is detected by carotid body and aortic bodies.
  • These send impulses to and stimulate the respiratory centre in medulla oblongata
  • The respiratory centre send impulses to the intercostal muscle and diaphragm muscles to contract more vigorously to increase ventilation.
  • When there is enough oxygen and less carbon dioxide the aortic and carotid bodies are less stimulated
  • The frequency and depth of contraction of intercostal and diaphragm muscles reduce. This reduces the ventilation rate.

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