The image of a key fitting into a keyhole is most useful in understanding how

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The image of a key fitting into a keyhole is a classic analogy for how neurotransmitters (the "key") bind to their specific receptor molecules (the "keyhole") on the surface of a neuron, initiating a response in the neuron. This process is crucial for the transmission of signals across the synaptic gap between neurons.  Neurotransmitters bind to receptor molecules if no other neurotransmitters or chemical substances are attached to the receptor molecule and if the shape of the neurotransmitter matches the shape of the receptor molecule, just as a key fits into a keyhole.

The Image of a Key Fitting into a Keyhole Is