Controlling Our Internal Environment (Homeostasis) :D

These cards include:

  • Homeostasis
  • The role of homeostasis

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Homeostasis can be defined as the maintenance of a *stable internal environment through negative feedback despite fluctuations in the external environment.

((*stable = conditions fluctuate within a narrow range about a set point))

Homeostasis controls:

  • Temperature
  • PH
  • Ion concentration in the blood
  • Glucose concentration in the blood
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The Role Of Homeostasis

  • Homeostasis provides a constant internal environment and independence from fluctuating external conditions.
  • Features that influence internal environment have a set level ((called the 'norm')).
  • Any changes from the norm are called 'deviation'.
  • Negative feedback is caused by deviation from the norm; it results in a return to the norm.
  • When the body experiences changes in the external environment, the homeostatic system evens out the variations experienced by the body in a number of ways:
    • The liver can store or release glucose
    • Blood is kept at a constant, ideal state; glucose concentration remains at 80mg/cm3
    • Tissue fluid surrounding the cells has constant ideal conditions and contains the optimum glucose concentration for respiration to occur
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