If nerves send signals via chemicals, then why do we never run out of them?

Question

If nerves send signals via chemicals, then why do we never run out of them?

In: Biology

Answer 1

The chemicals, neurotransmitter molecules, are released into a small space called the synaptic cleft. After they’re used, the majority will be recycled for the next neuron firing. This process of recycling is called reuptake and some medicines work by acting on this processes such as selective serotonin reuptake inhibitors.