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Question

Which of the following is not true about the olfactory system?


  1. The olfactory bulbs are a pair of swellings above the olfactory epithelium.

  2. Olfactory bulb is a relay center for the information of smell.

  3. The olfactory epithelium has a mucous layer and therefore only non-water soluble odor molecules will be able to pass easily.

  4. Olfactory epithelium is in the middle of the place where your eyes sit in your skull.


Solution

The correct option is C

The olfactory epithelium has a mucous layer and therefore only non-water soluble odor molecules will be able to pass easily.


The olfactory epithelium is involved in the first step of the sense of smell. It has a mucous layer covering the chemoreceptors. This mucous layer makes sure that only water-soluble odour molecules are able to pass through it easily and activate the chemoreceptors that are involved in the sensation of smell.

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