Odorants and tastants?

Why must odorants and tastants be dissolved before they can be perceived ?

Answers:    Odorants call for to be volatile so it can be transported to the olfactory system and it needs to be within a sufficiently high concentration to be capable of interact with one or more of the olfactory receptors.

Whereas the tastrants inevitability to be dissolved and mixed up with dampen (saliva) so that it can get into the soft spot buds and perceived by gustatory nerves.

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