Page 123 - (DK) Danger! Open with Extreme Caution!
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Adrenal glands These two glands sit on top of the kidneys. When they receive signals from the brain, the glands release the hormones adrenaline and noradrenaline into the bloodstream. They have the same effect as the ANS on organs such as the heart, lungs, and muscles to reinforce and prolong their actions. Blood vessels in muscles Unlike blood vessels in the skin, those supplying the skeletal muscles— which move the legs, arms, and res
Liver
One of the liver’s many jobs is to store glucose—the body’s main fuel. When danger threatens, the liver releases glucose from its stores to boost levels in the bloodstream. Blood carries these extra supplies of glucose to the muscles so that they have sufficient energy to move the body for fight or flight. Blood vessels in skin People who are scared generally turn pale, or “white with fright.” That’s because the signals from the brai
FIGHT-OR-FLIGHT RESPONSE 123
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