CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration of the behaviour of neurotransmitters in a synapse between two neurons. Neurotransmitters are endogenous chemicals that transmit signals from a neuron to a target cell across a synapse. In response to an electrical signal in the transmitting neuron, vesicles containing neurotransmitters fuse with the cell wall allowing the neurotransmitters to enter the synapse. They move toward the receiving neuron and attach themselves to receptors (green), relaying the message. Extra neurotransmitters migrate back to the transmitting cell via reuptake transporters.
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