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==Key Stage 3==
===Meaning===
[[Smell]] is one of the 5 main allows [[humananimal]] s to detect certain [[sensechemical]]sin the [[air]].
===About Smell===
: [[Smell]] allows is one of the 5 main [[animalhuman]]s to detect certain [[chemicalsense]]s in the [[air]].
==Key Stage 4==
===Meaning===
: [[Smell]] is one of the 5 main allows [[humananimal]] s to detect certain [[sensechemical]]sin the [[air]].
===About Smell===
: [[Smell]] allows is one of the 5 main [[animalhuman]]s to detect certain [[chemicalsense]]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)]].