Card 14 / 27: 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.

Keyboard Shortcuts