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OCR A Biology

Chemoreceptors Blood Ph Co2 Detect Increases Heart Rate

Chemoreceptors in blood vessels detect changes in blood pH (due to CO2) and adjust heart rate to regulate breathing.

Quimiorreceptores nas artérias carótidas e aorta detectam mudanças no pH do sangue (devido ao CO2) e ajustam a frequência cardíaca para regular a respiração.

Front chemoreceptors in blood vessels
Back
  • sensitive to changes in blood pH (e.g more CO2 in blood, more interacts with water to from carbonic acid so pH decreases), chemoreceptors detect this and response increases heart rate so blood travels quicker to lungs and more CO2 exhaled
  • if low CO2, pH increases and chemoreceptors detect change, results in less impulses sent to medulla and so less impulses sent to SAN via sympathetic NS, and so heart rate returns to normal

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