BIO SCI 47 Chapter Notes - Chapter 9: Substance P, Fibromyalgia, Overacting
6 Jun 2018
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Stress and Pain
● Pain is useful bc it informs us of unsafety
○ Discourages us from hurting something further that is already injured
● Spinal Reflex
○ Receptors send nerve projections to spinal cord
○ Spinal neurons rapidly send commands to muscles
■ Ex, jerk finger away from flame
● Fast fiber and slow fiber send pain
● Pain receptors are all over the body and the spine receives them
○ Spinal neurons that are activated by pain send projections to the brain
● Brain’s interpretation of pain varies
● Three ways the brain emotionally responds to pain
○ the emotional/interpretative level can be dissociated from the objective
amount of pain signal that is coursing up to the brain from the spine /
■ Pain can be the same but responses can differ
○ those more emotive parts of the brain not only can alter how you respond
to pain information coming up the spinal cord; those areas of the brain can
alter how the spinal cord responds
to pain information
○ Stress
Stress-Induced Analgesia
● Stress can inhibit pain
○ Enkephalins, dynorphins, and endorphins
Document Summary
Pain is useful bc it informs us of unsafety. Discourages us from hurting something further that is already injured. Receptors send nerve projections to spinal cord. Spinal neurons rapidly send commands to muscles. Fast fiber and slow fiber send pain. Pain receptors are all over the body and the spine receives them. Spinal neurons that are activated by pain send projections to the brain. Three ways the brain emotionally responds to pain. The emotional/interpretative level can be dissociated from the objective amount of pain signal that is coursing up to the brain from the spine / Pain can be the same but responses can differ. Those more emotive parts of the brain not only can alter how you respond to pain information coming up the spinal cord; those areas of the brain can alter how the spinal cord responds to pain information.
