Axon Terminal - Synaptic Vesicle - Neurotransmitter

Synapse - Neurons communicate with each other across a tiny gap known as the synapse. neurons never physically touch, but the electrical impulse is carried from the axon terminal of the presynaptic cell to the receptors on the dendrites of the postsynaptic cell.

Relationship - Neurotransmitters and Receptors

Neurotransmitters - Neurotransmitters are endogenous chemicals that are released from the synaptic vesicles in the axon terminal of the presynaptic cell to hook up to a receptor on the dendrite of the postsynaptic cell. Neurotransmitters are like keys which fit into the receptor lock. The receptor will recognize only one type of receptor. When a neurotransmitter is received by a receptor it either excites (depolarizes) or inhibits (hyperpolarizes) the postsynaptic cell. When a neuron is depolarized the membrane becomes more permeable to Na+ and is closer to firing (action potential). When a neuron is hyperpolarized the membrane becomes impermeable to Na+ and is harder to fire.