This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
Vomiting center is located at 
Select and explain. 
A. Area postrema, B. Amygdala, C. Pons, D. Hypothalamus
A: Area postrema
Answer: A: Area postrema 
Explanation: (A) Area postrema # Chemoreceptor cells in the medulla initiate vomiting when they are stimulated by certain circulating chemical agents.> Chemoreceptor trigger zone cells are located in Area postrema, a V-shaped band of tissue on the lateral walls of the fourth ventricle near the apex.> Swallowing, coughing, sneezing, gagging, and vomiting are also reflex responses integrated in the medulla oblongata.> Vomiting is another example of the way visceral reflexes integrated in the medulla include coordinated and carefully timed somatic as well as visceral components.> Vomiting centre in the reticular formation of the medulla really consists of various scattered groups of neurons in this region that control the different components of the vomiting act.