1. Your heart rate and blood pressure increase so that your brain has more blood and your decision making becomes clearer.
2. Your blood sugar rises to give your body more energy to run.
3. Blood is shunted away from the gut and to the large muscles of the legs and arms so you can run faster.
4. Clotting occurs more quickly to prevent blood loss should you be speared.
The drawbacks are that in modern times repeated stress can contribute to hypertension, heart attacks, diabetes, ulcers, depression, anxiety and neck and back pain. Many of the effects are due to the increased activity in the sympathetic nervous system. Which, pours out adrenaline, cortisol along with other stress-related hormones. For a graphic model of stress visit Stress Free Net.
The best way I have found to deal with stress is to invoke the “relaxation response”, which invokes the parasympathetic nervous system and has the opposite effect of the sympathetic nervous system on the body. The parasympathetic nervous system is responsible for energy conservation and relaxation. The benefits are:
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