Neurotransmitters are chemicals released in minute amounts from the terminals of nerve cells in response to the arrival of an action potential. There are now more than 300 known neurotransmitters and they act either locally in point-to-point signal...

Chemical substances used for signalling between neurons in the nervous system. Transmitters are released at the SYNAPSE by the PRESYNAPTIC neuron into the SYNAPTIC CLEFT. They then bind to RECEPTORS on the POSTSYNAPTIC neuron or an effector organ such...

Neurotransmitters are chemical substances that transmit information between nerve cells, neurons, and between neurons and effectors, muscles or glands. The transmission occurs across a narrow gap or cleft at the synapse, microscopic distance between a...

Neurotransmitters are special chemicals which help to pass nerve impulses on from one neuron to another. When a nerve impulse runs down the axon of a neuron, ultimately it arrives at the axon terminal, where the synaptic knobs are located. The synaptic...

A neurotransmitter is any chemical substance (the first recognized was ACETYLCHOLINE) that NEURONS (nerve cells) secrete to communicate with their target cells (glands, muscles, and other neurons). Neurotransmitters diffuse from their sites of...

Chemical released by neurons to stimulate neighbouring neurons, allowing impulses to be passed from one cell to the next throughout the nervous system. A nerve impulse arriving at the axon terminal of one neuron stimulates release of a...

A broad term, neurotransmission indicates communication between cells in the NERVOUS SYSTEM (and between cells of the nervous system and other tissues; see NEUROMUSCULAR JUNCTION). Neurotransmission can be chemical or electrical: chemical communication...

A substance that facilitates the transmission of the signal from a nerve to the cell. Depletion of the substance reduces the capacity for transmission. Parkinson’s disease is a condition arising from a depletion of the neurotransmitter known as...

Neurotransmitters are chemicals that are used to relay, amplify and modulate signals between a neuron and another cell. According to the prevailing beliefs of the 1960s, a chemical can be classified as a neurotransmitter if it meets the following...