Homeostasis in Action

Homeostasis in Action - chapter 12.

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  • Homeostasis in Action
    • Controlling Body Temperatures
      • Normal internal body temperature is 37C - optimum for enzymes in the body.
      • Temperature changes in the body are detected by thermo-receptors in the skin and the thermo-regulatory centre in the hypothalamus in the brain.
      • When the body gets too hot it responds in various ways:
        • Hair lies flat  and increases rate of heat loss
        • Sweating increases and water evaporates, transferring energy to the surroundings
        • Blood vessels dilate and let more blood flow through the capillaries near the skin. Your skin flushes so you transfer more energy by radiation to the surroundings
      • When the body gets too cold it responds in various ways:
        • Hairs stand on end (erector muscles) and trap a layer of air for insulation
        • Shivering - muscles contract with energy from respiration to produce heat.
        • Blood vessels constrict so less blood flows in skin capillaries, reducing energy transferred by radiation to the surroundings
    • Removing Waste Products - Excretion
      • The 4 main excretory organs are: the skin, the lungs, the liver and the kidneys.
    • The Human Kidney
    • Dialysis - The Artificial Kidney
    • Kidney Transplants


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