Circulating chemicals such as alcohol ipecac Stephen Vo @University

Question 12 / 23: Circulating chemicals such as alcohol, ipecac, etc. stimulate this region in the floor of the fourth ventricle because:

A. There is no blood-brain barrier so substances have direct access to appropriate chemoreceptors.

B. The substances circulate through the ventricular system and directly stimulate the vomiting
center.

C. They cause a decrease in threshold for neural circuits.

D. Visceral afferents in the tractus solitarius are hyperexcitable.

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Explanation:

Direct access to the CNS through an incomplete blood brain barrier in the region of the area postrema (arrow) is how some drugs are able to affect the CNS.

Quiz Home Page

https://www.jobilize.com/ch-06-head-somatic-visceral-sensory-systems

Ch 06: Head Somatic & Visceral Sensory Systems

Author:

M.D.Stephen VoronLecturer

University of Utah

USA

Access: Public Instant Grading

Attribution: Stephen C. Voron, M.D., Suzanne S. Stensaas, Ph.D. , Department of Neurobiology and Anatomy, University of Utah, School of Medicine, Salt Lake City, Utah 84132, http://library.med.utah.edu/kw/hyperbrain

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