Assorted References. 1  cloning (in cloning) 2  cytoskeleton (in cytoskeleton) 3  fluid regulation (in excretion: Regulation of water and salt balance) 4  genetic behaviour (in genetics) 5  immune system (in immune system: Cellular defenses) 6  interaction with drugs (in drug: Mechanisms) 7  mutation (in mutation (genetics)) 8  cytology (in cytology)
Definition of neurotransmitter in English: A chemical substance which is released at the end of a nerve fibre by the arrival of a nerve impulse and, by diffusing across the synapse or junction, effects the transfer of the impulse to another nerve fibre, a muscle fibre, or some other structure.Example sentences.oun. A chemical substance which is released at the end of a nerve fibre by the arrival of a nerve impulse and, by diffusing across the synapse or junction, effects the transfer of the impulse to another nerve fibre, a muscle fibre, or some other structure.
Neurotransmitters are endogenous chemicals that enable neurotransmission. They transmit signals across a chemical synapse, such as in a neuromuscular junction, from one neuron (nerve cell) to another target neuron, muscle cell, or gland cell. Enzyme degradation â special chemicals called enzymes break it down. 2  Reuptake â re-absorption of a neurotransmitter into the neuron. 3  Transporters, or membrane transport proteins, pump neurotransmitters from the synaptic cleft back into axon terminals (the presynaptic neuron) where they are stored.