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In page Central chemoreceptor:

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Central chemoreceptors are located in the so-called chemosensitive area, a bilateral region[1] of the ventrolateral[2] medulla oblongata situated 0.2 mm beneath the ventral surface of the medulla,[1] near the origins of cranial nerves IX and X from the brain.[citation needed] The chemoreceptors relay sensory information to the respiratory center.[1]