reflex

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However, structures such as the area postrema, median eminence, portions of the hypothalamus, and other circumventricular organs that lie outside the blood-brain barrier play an integral role in the vomiting reflex.
Though gross, this vomiting reflex is such a valuable lifesaver, says Koch, that many other animals, including dogs, cats, birds, frogs, and fish, have it too.
Selection of a particular type of drug therapy can be facilitated by an understanding of the essential anatomy and physiology of the vestibular system and the associated vomiting reflex.