This activating system and the chemical system, acting together, provide us with the power and energy and speed to escape from the most lite threatening situations, Where survival depends on speed. The full pattern of what happens in the body and brain are shown here.
HEART The heart rate is increased giving a faster heart beat.
BLOOD VESSELS
There is a mechanism which makes the blood clot, so that when you are injured you do not lose all your blood. This clotting facility is increased under stress.
CIRCULATION This is increased to the brain for faster coordination. It is also increased to the limbs to power them for action.
LUNGS These are stimulated to make breathing faster and to quicken the oxygenation of the blood.
LIVER This releases sugar stores for quick energy.
STOMACH Digestion is stopped as blood is diverted away from the skin and stomach to the limbs to power them for action.
