Stress and Health

Stress and Health - Stress and Health 1 2 Describe...

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Stress and Health 1. 2. Describe the "fight-or-flight" response to stress and the physical characteristics and phases of the general adaptation syndrome. Walter Cannon observed that, in response to stress, the sympathetic nervous system activates the secretion of stress hormones, triggers increased heart rate and respiration, diverts blood to skeletal muscles, and releases fat from the body's stores, all to prepare the body for either "fight or flight." In Hans Selye's general adaptation syndrome (GAS), the body's adaptive response to stress is composed of three stages. In Phase 1, we experience an alarm reaction due to the sudden activation of our sympathetic nervous system. Heart rate increases and blood is diverted to the skeletal muscles. With our resources mobilized, we then fight the challenge during Phase 2, resistance. Temperature, blood pressure, and respiration remain high and there is a sudden outpouring of stress hormones. If the stress is persistent, it may eventually deplete our body's reserves during Phase 3, exhaustion. With exhaustion, we are more vulnerable to illness or even, in extreme cases, collapse and death. 3.
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Stress and Health - Stress and Health 1 2 Describe...

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