Keeping the Body in Balance

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Keeping the Body in Balance

• Prentice Hall
• 1.2

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Objectives

• Students will be able to define homeostasis
• Students will be able to describe the physical
  responses to stress and ways to deal with stress

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Homeostasis

• Is the process by which an organisms internal
  environment is kept stable in spite of changes in
  the external environment (body stays balanced
  regardless of the environment)
• Examples when you eat food or drink fluids or
  sweating

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Stress and Homeostasis

• Stress is a reaction from your body and mind
• Examples of stressors are a snarling dog, fight,
  or tests
• Physical responses to stress during the alarm
  stage the body releases adrenaline into the
  bloodstream causing the following
• More blood goes to brain
• Hearing ability increases
• Sweating increases
• Muscles tense, blood receives more energy
  producing substances, body cells release energy
  faster
• Pupils of eyes widen to take in more light
• Heart rate increases
• Digestive system slows

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Stress and Homeostasis

• During the alarm stage the body releases
  adrenaline into the bloodstream
• Fight or flight response
• Caused by adrenaline

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Long Term Stress

• If the stress is not dealt with you may become
  tired, irritable, have trouble getting along with
  others and possible sick

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Dealing with Stress

• Stress is normal
• Deal with stress, recognize it and take action,
  dont ignore it
• Physical activity can help with stress