It is untrue to say that until emergency medical services come, you should keep a person experiencing serious internal bleeding from going into shock.
The blood arteries constrict and clots develop as the body's early physiological responses to bleeding. When a disruption in the wall of a bleed vessel is detected by the body, these two mechanisms combine to reduce the amount of blood lost. Hemostasis is the collective term for these reactions.
Lie the subject down. Lift the injured limb above the injured person's heart if they sustain an injury to a limb.
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