[opening voice over] When exposed to trauma, the body deploys its own defence system. From the first second the brain receives the signal that a catastrophe has happened, the blood rushes to the organs that need help the most. Blood floods into the muscles, the lungs, the heart, the brain. The brain makes a decision for the rest of the body. Either face the danger or run away. It's a mechanism designed to protect the body from harm. From knowing that what has happened might be irreparable, we call it 'shock'.
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