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health advisory Hospital Doctor Yu 2007-11-8 19:08:24

Answers:

Vomiting is supposed to expel dangerous stuffs from the stomach.

Some evolutionary biologists believe that vomiting in response to odors is designed to prevent us from eating things that are bad for us. For example, some carnivores can eat spoiled meat. Humans can't. The smell of spoiled meat makes us nauseated, and may even make us throw up so that we don't eat spoiled meat. It may be an over-reaction. We are supposed to feel sick to overcome any hunger pangs, but we go too far and throw up.

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because pungent smell stimulate the CTZ (CHEMO RECEPTOR ZONE)PRESENT IN MEDULLA(BRAIN)RESPONSIBLE FOR THE VOMITING

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Very good questions. I have no idea :(

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well,this is due to stimulation of chemoreceptor trigger zone which lies in the medulla.

#there are many sources for vomiting like:

1-vestibular system which sends information to the brain via cranial nerve VIII (vestibulocochlear nerve),it plays a major role in motion sickness.

2-cranial nerve X (vagus nerve),which is activated when the pharynx is irritated,leading to a gag reflex.

3-vagal and enteric nervous system inputs that transmit information regarding the state of the gastrointestinal system.

4-CNS mediates vomiting arising from psychiatric disorders and stress.

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Your body has a self curing mechanism soon as any alien thing tries to enter your body your body tries to defend itself from that invasion and induces vomiting so you dont get sick afterwards !

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