Homeostasis
- Created by: Nika Nerd
- Created on: 24-03-14 18:00
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- Homeostasis
- Maintenance of a constant internal environment
- Constant levels are gained by negative feedback
- BLOOD GLUCOSE LEVELS
- The pancreas releases two hormones to act on the liver
- Insulin
- Lowers blood sugar levels
- Released when chemoreceptors detect high glucose levels
- Usually after a meal
- Glucose taken up by the liver and converted into glycogen for storage
- Inhibits glucagon
- Untitled
- Deficiency= type 1 diabetes
- Can be treated by
- Injecting insulin after meals
- Careful dieting
- Can be treated by
- Deficiency= type 1 diabetes
- Glucagon
- Increases blood glucose levels
- Released when drop in glucose levels detected
- Liver converts glycogen to glucose and releases it into the blood
- Inhibits insulin production
- Deficiency= type 2 diabetes
- Can be treated by
- Insulin
- The pancreas releases two hormones to act on the liver
- OSMOREGULATION
- Maintenance of water levels in the blood and body tissues
- Regulated by kidneys
- Controlled by the hormone ADH
- Lost in urine
- THERMOREGULATION
- Heat lost by
- Sweating (evapouration)
- Hairs lying flat
- Movement of blood to skin surface
- Heat retained by
- Stopping sweating
- Shivering
- Raising hairs(insulation)
- Movement of blood away from skin surface (vasoconstriction)
- Heat lost by
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