Pain . Pain occur due to tissue damage: damage due to extreme mechanical, thermal or chemical stimulation.Pain is a protective mechanism: person try to remove the tissue damageloss of pain perception can cause and increase tissue damage (e.g bed sores in bedridden. Pain . Stimulus? activate pain receptor ? transmision by nerve fiber ? CNS (S.C,spinothalamic tract, brain stem, thalamus, cortex)Pain: 2 types Fast pain (acute pain, sharp pain..etc)Slow pain (chronic pain, aching pain..etc1145
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