Homeostasis in Action
Homeostasis in Action - chapter 12.
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- Created on: 16-07-22 16:25
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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
- Controlling Body Temperatures
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