Chemical Messengers

At a synapse, neurons use chemicals to deliver and receive impulses. Presynaptic substances are exocy-tosed into the synaptic cleft and received and acted upon by postsynaptic receptors. These rapidly open membrane ion channels or act via second messenger systems (the transmitter is the first messenger) to elicit changes in postynaptic activity. Such effects, with the many diverse mediators (biogenic amines, peptides, growth hormones, gases), fluctuating activity of neurons, and multiple modes of prolonging or stopping messages, permit many combinations of factors to be in play at any time. The synapse is thus a multifactorial, extremely versatile information transfer system. This type of system is physically difficult for the investigator to study and clearly more complex postsynaptically than described in many accounts.

Aspergers Answers Revealed

Aspergers Answers Revealed

Learn How to Help, Understand amp Cope with your Aspergers Child from a UK Chartered Educational Psychologist. Before beginning any practice relating to Aspergers it is highly recommended that you first obtain the consent and advice of a qualified health,education or social care professional.

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