Neurotransmitter
* All neurotransmitters have an excitatory effect.
* Every neurotransmitter has only a single receptor.
* Many neurotransmitters are important factors in the regulation of GnRH neuron secretion
  - can mediate fast or slow synaptic transmission depending on the cell type
* Most neurotransmitters are specific for the kind of information that they are used to convey
  - bind to receptors
  - have effects
* Some neurotransmitters act across great distances within an animal
  - are inhibitory on their receptors
  - cause anxiety
  - create resistance
  - excite the second cell allowing it to generate an electrical pain signal
* Some neurotransmitters involve in human sexual responses
  - play similar roles in very different organisms
  - produce longer effects than others
* act on the receptors.
* also allow nerves to communicate with muscle cells in order to create motion.
* are a class of molecules that facilitate the transmissions of nerve impulses
  - able to work by attaching to key sites on neurons called receptors
  - an essential part of our everyday functioning
  - another factor thought to contribute to addictive personalities
  - basically chemical messengers in the brain
  - biochemical substances that stimulate other neurons
* are brain chemicals that are released by nerve cells
  - facilitate communication between brain cells
* are chemical messenger molecules that are produced within nerve cells
  - messengers that pass on information between nerve cells
  - signals used as a means of communication
  - substances that transmit information from one cell to another
* are chemicals in the brain that carry signals from one nerve cell to another
  - send signals
  - stored in synaptic vesicles of axon
* are chemicals that allow electrical impulses to flow between nerves
  - for communication between neurons
* are chemicals that carry messages between brain cells
  - from one nerve cell to the other
  - conduct signals from one nerve cell to the next
  - help carry electrical impulses along the nervous system
  - make it possible for the brain to communicate with itself
  - neurons use to signal and stimulate one another
  - transmit signals from one nerve cell to another
* are chemicals which carry information between nerve cells
  - pass information across the synaptic gap
  - transmit messages from neuron to neuron
  - electro-biochemical agents that cross nerve synapses
  - encased in vesicles for transport out of a cell via exocytosis
  - inanimate objects
* are molecules that are used to carry signals from one neuron to another
  - brain and nerve cells use to communicate
  - cross the synapse
  - relay signals by moving from one neuron to the next
  - organic compounds
  - present in the developing retina prior to synapses
  - pumped into vesicules by transport proteins in the membrane
  - similar in all five
  - small molecules that signal nerve cells to fire
  - substances that one neuron uses to trigger another in the brain
  - substances, which transfer the messages from one nerve cell to another
  - the brain's chemical messengers
* are the chemical bridges that connect brain cells
  - language of the brain
  - messengers between nerve cells
* are the chemical messengers of our brain and nerves
* are the chemicals that carry signals from one nerve cell to another
  - control our moods and reactions
  - ion channels in receptor cells
  - messengers within the central nervous system
* arrive at the depicted neuron from efferent axons.
* attach, or bind, to certain receptors.
* bind to proteins, called receptors, on the surface of receiving neurons
* can act directly on ion channels to modify the permiability of cells to ions
  - be excitatory or inhibitory
  - either be excitatory or inhibitory
  - have either an excitatory or inhibitory effect on a postsynaptic cell
  - trigger the activation of several signal transduction pathways
* carry impulses between the nerve cells in the brain.
* carry messages from one nerve cell to another
  - messagesfrom one nerve cell to another
  - nerve impulses through particular nerve pathways
  - the signal of a nerve impulse over the synapse or space between nerve cells
* control our thought processes and emotions.
* diffuse across the plasma membrane of the post-synaptic cell
  - synaptic cleft
* exert their effects by binding to specific receptors sites on nerves.
* fly into synaptic cleft.
* function in milliseconds.
* generally have one of two special functions.
* get out of balance for many reasons.
* have an important role in the normal functioning of an individual
* help nerve cells communicate
  - in the brain communicate with each other
* make learning, memory and intelligence possible.
* play a complex role in the brain and nervous system
  - major role in shaping everyday life and functions
  - variety of roles in the body
  - vital role in synaptic transmission
* primarily affect our moods and emotions.
* release energy at a synapse, the joining of one nerve cell to another.
* transmit electrical signals between brain cells
  - nerve impulses from one nerve to another
* travel between neurons through a fluid-filled space called the synapse.
+ Key-lock principle: Molecular biology
  * Neurotransmitters act on the receptors. Some drugs may start the same actions.