Receptor: This is a protein molecule that receives and responds to neurotransmitters; it's like the mailbox where our 'mail carrier' delivers its message.
Synaptic Cleft: The small gap between two neurons into which neurotransmitters are released; this can be thought of as the street our 'mail carrier' must cross to deliver their message.
Dopamine: This is an example of a specific neurotransmitter, known for its role in reward and pleasure systems in humans. Imagine dopamine as a special delivery package filled with joy!