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How do aortic bodies contribute to the cardiovascular effects of hypoxia?

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A pine grosbeak with pink and gray plumage perches on a branch, eating red berries among autumn foliage. — Chemoreception Animals, such as this pine grosbeak, use chemoreception to respond to chemicals that can be tasted and smelled in their environments. Many of these chemicals affect behaviors such as food preference and defense.

The aortic bodies, located near the arch of the aorta, serve as peripheral chemoreceptors that detect acute changes in the partial pressure of arterial oxygen. While the carotid bodies are the primary sensors for respiratory adjustments, the aortic bodies are specifically responsible for mediating many of the cardiovascular effects associated with hypoxia.1

These receptors function as part of a reflex pathway that projects to the medulla oblongata, specifically the nucleus of the solitary tract. By sensing reduced oxygen levels, the aortic bodies trigger the chemoreceptor reflex, which regulates cardiac output and regional blood flow. This mechanism ensures that, during periods of oxygen deprivation, the body prioritizes the delivery of oxygen to vital organs such as the brain and the heart.2