Question: What happens to the molecules we breathe in afierce we smell them?

Vassilis Sideropoulos answered on 14 Mar 2019:

Odor molecules are very small, about ten times smaller than the receptors found on cells in our nose. As we know odor molecules are everywhere in the atmosphere until they are sucked in when we take a breath. If there’s a right receptor there, the odor molecules binds to it and then sends a signal to our brain – and once the signal has been processed and analysed by our brain we have our Ah hAAAA! moment where we realise that we have either smelled something nice (roses, fruits) or something stinky!