Question

Which of the following is not true about olfactory system?

• A. Olfactory epithelium is in the middle of the place where your eyes sit in your skull.
• B. The olfactory bulbs are a pair of swellings above the olfactory epithelium.
• C. Olfactory bulb is a relay center for the information of smell.
• D. The olfactory epithelium has a mucous layer and therefore only non-water soluble odor molecules will be able to pass easily.

Answer 1

Answer: (D)

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

The olfactory epithelium involved in the first step of the sense of smell has a mucous layer covering the chemoreceptors. This mucous layer implies that only water-soluble odor molecules will be able to pass through it easily and activate the chemoreceptors involved in the sensation of smell.