The odor molecules transmit messages to the limbic system, the area of the brain that governs emotional responses.

The intricate shape allows the receptor to respond to molecules from the outside world, like odor molecules.

Are odor molecules still in the nose, or is it psychological?

ORs can bind to a variety of odor molecules, with varying affinities.

These olfactory cells bear receptors that unite with odor molecules.

This would have reduced the need for the filtering apparatus and with it the losses of absorbed odor molecules.

According to the shape theory, each receptor detects a feature of the odor molecule.

However, in bio-electronic noses, receptor proteins which respond to specific odor molecules are used.

As vertebrates moved on land, the ancestral nose was modified to capture odor molecules from the air.

Ozone reacts with odor molecules in the air, permanently eliminating them.