Isabella is putting mustard on her hot dog. She realizes she has put too much on and sucks up some of it back into the squeeze bottle. This process is similar to

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The process of sucking up some of the mustard back into the squeeze bottle is similar to the process of reuptake, which occurs when neurotransmitters are taken back up into the presynaptic neuron after they have been released into the synaptic cleft. In both cases, a substance that has been released is being taken back up to reduce its concentration.

Isabella Is Putting Mustard on Her Hot Dog