Sheepdog Tip of the Day, During Combat tip 23
At low levels of vasoconstriction (from cold or stress), only the little capillaries shut down, causing some loss of fine-motor control. It happens to your fingers on those cold mornings and it happens when you are under stress. As the vasoconstriction becomes more intense, the blood flow to the complex motor muscles begins to shut down. The blood pools into the body core and large muscle groups, and your blood pressure skyrockets. The outer layer of your body becomes almost a layer of armor, and as long as an artery is not hit, you can take extensive damage without much blood loss.
Lt. Col. Dave Grossman, On Combat
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Additional Resources
For PTSD, Shepherd Resource Group.