Why must taste and odor molecules be removed from receptor cells after detection?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A pine grosbeak with pink and gray plumage perches on a branch, eating red berries among autumn foliage. — Chemoreception Animals, such as this pine grosbeak, use chemoreception to respond to chemicals that can be tasted and smelled in their environments. Many of these chemicals affect behaviors such as food preference and defense.

It is essential that taste and odor molecules are removed from the immediate environment of the receptor cell after detection to ensure that the organism does not continue to respond to a stimulus that is no longer relevant.1

If these molecules were not cleared, the receptor cells would remain in a state of constant stimulation, preventing the system from accurately reflecting changes in the environment. This removal process is thought to be facilitated, at least in part, by odorant-degrading enzymes present in the mucus or other fluids surrounding the sensitive endings of the receptor cells.1