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PAIN (PHYSIOLOGY OF PAIN (FIRST ORDER NEURON - Nociceptor - Carries…
PAIN
PHYSIOLOGY OF PAIN
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Skin, muscle, viscera are connected to a three-neuronal pathway
THIRD ORDER NEURON - Relays information from the thalamus to the cerebral cortex (individual becomes aware of the pain
This means that the stimulus has to be detected in the tissue and then information about the tissue damage relayed to the cerebral cortex - where it is consciously perceived as pain
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SYNAPSE
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Chemical synapses transmit signals from neuron to another using neurotransmitters - Inhibitory - Excitatory
NEURON (nerve cell)
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Amitotic - Unable to divide, can't produce new cells if destroyed
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High metabolic rate - requires continuous and abundant supplies of oxygen and glucose - can't survive a few minutes without oxygen
ACTION POTENTIAL
Neurons generate & conduct electrical and chemical impulses as there means of communication - achieved by movement of electrolytes (sodium and potassium) across the cell membrane
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