What is one of the functions of presynaptic neurons?

Presynaptic neurons play a crucial role in transmitting signals between neurons in the nervous system. One of their primary functions is to release neurotransmitters at synaptic junctions. When an action potential reaches the presynaptic terminal, it triggers the release of these neurotransmitters into the synaptic cleft. These chemicals then bind to receptors on the postsynaptic neuron, facilitating communication between the two neurons. This process is essential for neurotransmission and enables the neural circuits to function properly, allowing for various physiological responses and behaviors.

The other options describe functions that are related to different parts of the nervous system or different types of cells. Receiving signals is a function of postsynaptic neurons, while generating action potentials is a characteristic of neurons and muscle cells, but not specific to presynaptic neurons. The formation of myelin sheaths is a role of glial cells, specifically oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system, rather than presynaptic neurons.