1.5 Homeostasis

• Homeostasis 

  • existence and maintenance of a relatively constant environment within the body
  • maintenance of a variable around an ideal normal value, or set point
• Set point

  • normal value or range
• 98.6 degree Fahrenheit or 37 degree Celsius

  • normal body temperature
• Negative Feedback Mechanism 

  • any deviation from the set point is made smaller or is resisted
  • the response to the original stimulus results in deviation from the set point, becoming smaller
• Three Components of NFM

  • Receptor
  • Control Center
  • Effector
• Stimulus

  • changed variables; homeostatic mechanism 
• Positive Feedback Mechanism 

  • response to the original stimulus results in the deviation from the set point becoming even greater
• Thrombin

  • chemical responsible for blood clot formation