Biology Homeostasis B12
- Created by: Catiebiddle
- Created on: 15-10-17 16:55
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- B12 Homeostasis in action
- Controlling Body Temperature
- monitored and controlled by thermoregulat-ory centre in brain
- if body temperature is too high blood vessals dilate
- sweat is produced
- if body temp is too low blood vessels constrict
- sweating stops and hairs on skin rise
- skeletal muscles shiver
- The kidney
- produces urine by filtering the blood
- selectively re-absorbs glucose ,and any mineral ions
- excess mineral ions and water are removed in urine
- water balance controlled by hormone ADH
- Removing waste products
- water leaves body via lungs
- water ,mineral ions and urea are lost through sweating
- urea , excess water and mineral ions are removed via kidneys
- urea is produced by breakdown of amino acids
- urea is poisonous and can damage cells if not removed
- Dialysis-artificial kidney
- Those with kidney failure can be treated with regular sessions on dialysis machine
- Controll of dialysis fluid containing glucose and mineral ions
- process depends on diffusion down concentration gradient
- kidney transplants
- Tissues are matched as carefully as possible to prevent rejection
- recipient is given drugs to prevent rejection
- There is a risk that antigens will attack antigens on donor organ
- Controlling Body Temperature
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