How does human smell work?

Find out how the human nose detects and identifies different smells.

Smell - key words

Odour molecule - A tiny chemical particle that we detect as a particular smell

Nostril - One of the two openings in the nose that we breathe and smell through

Sense receptors - Cells that respond to something by sending messages to the brain

Mucus - Slippery, sticky substance that protects the body, for example snot in your nose

Nerves - Cells that carry messages between the brain and the rest of the body