What occurs when the emetic zone is stimulated?
A) Regurgitation
B) Nothing due to overriding by mature centers
C) Projectile vomiting
D) Gagging
C
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The more primitive center is called the emetic zone. When stimulated, it initiates projectile vomiting. This type of intense reaction is seen in young children and whenever increased pressure in the brain or brain damage allows the more primitive center to override the more mature chemoreceptor trigger zone (CTZ). Regurgitation is vomiting. In adults the CTZ does not always override the emetic zone (patient with a severe head injury), and gagging is an adult precursor to vomiting.
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