aortic body

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aortic body

one of several small structures on the arch of the aorta that contain neural tissue sensitive to the chemical composition of arterial blood. The aortic bodies respond primarily to large reductions in blood oxygen content and trigger an increase in respiratory rate. See also aortic-body reflex, carotid body.

aortic body

A chemoreceptor in the wall of the aortic arch that detects changes in blood gases, esp. oxygen, and pH. It is innervated by the vagus nerve and stimulates reflex changes in heart rate, respiration, and blood pressure that restore normal blood oxygen levels.

aortic body

A chemoreceptor in the wall of the aortic arch that detects changes in blood gases, esp. oxygen, and pH. It is innervated by the vagus nerve and stimulates reflex changes in heart rate, respiration, and blood pressure that restore normal blood oxygen levels.
See also: body

aortic body

an area of nervous tissue in the wall of the AORTA, close to the heart, which is sensitive to small changes in blood CO2 levels. A rise in partial pressure of CO2 triggers nerve impulses from the aortic body to cardiac/respiratory centres in the hindbrain via afferent nerve fibres (see BREATHING). A drop in CO2 pressure causes inactivation of the aortic body (an example of a negative FEEDBACK MECHANISM).