perireceptor event

The perireceptor event is the initial stage in chemoreception, encompassing processes that occur before a chemical molecule interacts with a receptor cell. This involves the molecule traversing a mucus layer to reach the receptor. For water-insoluble compounds, soluble proteins in saliva or nasal mucus bind to them, aiding their transport to the receptor cells.1

In olfactory receptors, proteins embedded in the cell membrane bind to odor molecules. This binding triggers a cascade of chemical events within the cell, ultimately leading to a change in electrical charge and the generation of a nerve impulse that is sent to the brain. These receptors are crucial for the sense of smell in many animals, including humans, and are located on olfactory receptor cells in the nasal cavity. The diversity of olfactory receptor proteins, encoded by a large family of genes, allows animals to detect and distinguish a wide range of odors.23