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9 terms

Neurotransmitters/neuromodulators and five major neurotransmitters

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What is a neuromodulator?
A chemical substance that regulates the activity of neurotransmitters at the synpase (it controls the strength of pain occuring) e.g. If your brak your leg, there will be heaps of neuromodulators trying to get to the CNS to tell you OUCH!
What is a neurotransmitter?
A chemical released by the synaptic button (when a neural impulse reaches the end of an axon)
What are two effects that can occur between neural impulses?
It can be inhibitory (blocks the postsynpatic button neuron from firing) OR it can be excitiory (stimulates the neural impulse in another neuron)
What are the FIVE MAJOR neurotransmitters?
Acetylcholine, Norepinephnne, Dopamine, Serotonin, Endorphins
What does Acetylcholine do?
Its found in all motor neurons and signals our muscles to CONTRACT! Its found in two large clusters of neurons in the brain that are associated with mental abilities (memory and learning)
What does Norepinephnee do?
Its involved in AROUSAL, LEARNING & MOOD. Involved when the autonomic nervous system is activated in extreme situations
What does Dopamine do?
Plays a role in regulating EMOTIONAL RESPONSE, its also in control of COMPLEX MOVEMENTS and is an EXCITATORY neurotransmitter. Amphetamines triggers the release of dopamine
What does Serotonin do?
Plays a role in temperature regulation sensory perception and impulsive behaviours
What does Endorphins do?
Natural system for pain relief produced in the CNS like panadol. Its INHIBITORY so it blocks the pain where the pain is being registered