Homeostasis- themaintenance of a constant internal environment

Homeostasis- themaintenance of a constant internal environment

1. Body Temperature

   • Temperature at which enzymes work best
   • 37 C
   • Too hot
     • Sweat glands in the skin release more sweat, which evaporates, removing heat energy from the skin
     • Blood vessels leading to the skin capillaries become wider (dilate) allowing more blood to flow through the skin, and more heat to be lost
   • Too cold
     • Muscles contract rapidly (shivering), which needs energy for respiration, some of which releases heat
     • Blood vessels leading to skin capillaries narrow, letting less blood flow to the skin and conserving body heat

2. Blood Sugar Level

   • Provide cells with a constant source of glucose for respiration
   • It is controlled by the release and storage of glucose, which is in turn controlled by insulin.

3. Water Content

   • Controlled to protect the cells to prevent too much water entering or leaving them
   • Water is lost through the lungs via breathing, the sking by sweating and the body through urine produced int the kidneys