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carotid body vs. carotid sinus

  1. a small mass of cells and nerve endings adjacent to the carotid sinus that, in response to chemical changes in the blood, adjusts the respiratory rate.
  1. specialized nerve end organs producing a slight dilatation of the carotid artery where it branches into the external and internal carotid arteries, responding to changes in blood pressure by mediating changes in the heartbeat rate.

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