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

As you said, neurons send signals to the neuron next to them via a flood of chemicals. These chemicals, called neurotransmitters, are released into the synapse that connects the two neurons. But, after they’ve done their job of sending the message, they are reabsorbed by the neuron. This process of reabsorption is called reuptake.