Definition: A protein on a cell wall that binds with specific molecules so that they can be absorbed into the cell in order to control certain functions.

Alright class, settle down, let’s take a look, At a word that’s important, like a helpful book! Today we're talking about receptors , you see, And what they do for our cells, wonderfully! The dictionary gives us the gist, it’s true, “A protein on a cell wall, working just for you!” Think of them like little doors, precise and neat, Waiting for molecules, a sugary treat! These receptors bind – that's the key, my friends, To specific signals, until the very end. Like a lock and key, a perfect match they find, Bringing messages inside, of every kind! They control the cell’s functions, you understand? Growth, movement, reactions, throughout the land! (Of your body!) So remember this rhyme, let it stick in your brain, Receptors – vital players, again and again! Do you have any questions about this concept bright? Let's discuss!