What is defined as the space between two neurons?

The space between two neurons is referred to as a synapse. This term describes the junction where one neuron communicates with another, allowing for the transmission of signals in the nervous system. When an electrical impulse travels down the axon of a neuron, it reaches the synapse and triggers the release of neurotransmitters. These neurotransmitters then cross the synaptic gap and bind to receptors on the receiving neuron, facilitating communication.

In contrast, neurotransmitters are the chemical messengers themselves that transmit signals between neurons but are not the space where this exchange occurs. Dendrites are the receiving parts of a neuron that receive signals from other neurons, and axons are the long, slender projections of neurons that transmit impulses away from the neuron's cell body. Thus, the correct answer highlights the specific aspect of neuronal communication, emphasizing the significance of the synapse in the overall functioning of the nervous system.