Changes

[[Smell]] is one of the 5 main [[human]] [[sense]]s.

: [[Smell]] allows [[animal]]s to detect certain [[chemical]]s in the [[air]].

: When an [[animal]] detects a [[chemical]] in the [[air]] [[Receptor Cell|receptor cells]] in the [[nose]] create an [[Action Potential|action potential]] which sends an [[Impulse (Biology)|impulse]] to the [[Central Nervous System|central nervous system (CNS)]].