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Adenosine is an inhibitory neurotransmitter that is involved in promoting sleep. After you wake up, adenosine levels begin to build up in your brain throughout the day causing you to become more and more sleepy

Neurotransmitters are signaling molecules that are secreted by neurons and affect another cell through synapses. The cell, body part or target cell that receives the signal may be another neuron, but also a gland or muscle cell.

Examples of excitatory neurotransmitters are glutamate, epinephrine and norepinephrine. Suppress. Inhibitory neurotransmitters block or prevent the transmission of chemical messages. γ-Aminobutyric acid (GABA), glycine, and serotonin are examples of inhibitory neurotransmitters. Neurotransmitters are often called chemical messengers of the body. They are molecules that the nervous system uses to carry messages between neurons or from neurons to muscles. Communication between two neurons takes place in the synaptic cleft, the small gap between synapses of neurons.

Learn more about neurotransmitters here

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