homeostasis

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homeostasis
- body temperature
  - cold
    - no sweat
    - hairs stand up - creating an insulating layer of air.
    - shiver - muscles contract which releases energy keeping them warm.
    - blood vessels supplying skin capillaries constrict closing off blood supply.
  - hot
    - best 37 degrees
    - sweat produced by glands - evaporate cooler.
    - blood flows closer to the skin.
    - blood vessels supplying the skin dilte.
- maintenance of constant internal environment
- maintaining body balance.
  - blood sugar levels
    - amount of sugar coming in and energy needed must be balanced.
- 2 poisonous waste products produced.
cold
- no sweat
- hairs stand up - creating an insulating layer of air.
- shiver - muscles contract which releases energy keeping them warm.
- blood vessels supplying skin capillaries constrict closing off blood supply.

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