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Homeostatis the ability to maintain a constant internal body condition despite changes in the einvironment.
water levels cells and tissue fluids remain isotonic and osmotic pressure is retained. - kidneys, sweat glands and lungs.
chemicals salts, glucose, wastes mineral ions etc. - Kidneys, digestive and hormones
levels of gases cells need O and produce C0 - lungs and circulatory systems
Cheap College Papers on animals
temperature too hot and enzymes denature, too cold and enzymes dont work. - basically all systems
pH 7.4 pH for enzyme action - circulatory and complex blood buffer systems.
FEED BACK MECHANISMS conditions senced, responses to the opposes change. - nerves and hormones
We Eat proteins
fats
carbohydrates
vitamins and minerals
GLUCOSE
excess - liver + insulin =right blood sugar - takes glucose out of blood stores as glycogen or fat.
too little - liver + glucagon = glycogen converted back to glucose and released into blood
Both the hormones in these are created in the Islets of Langerhans in the pancreas
FATS
liver removes excess fat from blood breaks it down and sends it to fat deposits
PROTEINS
body dosent store proteins or amino acids. The liver destroys and makes into urea which is then taken to the kidneys and eliminated from the body.
Vitamins and Minerals
Minerals-potassium,copper and iron
Vitamins - A,D and B1 BOTH STORED IN LIVER
excess V+Ms are taken to kidney and eliminated from body
Osmoregulation - kidneys make sure there is a steady water balance and that is controlled by the brain. The hormone ADH helps this to happen. Osmotic pressure of the blood is also retained.
FOOD TESTS
starch iodine and solution being tested
starch = black
Glucose benedicts solution and heat
glucose = green, yellow and orange
Protein sodium hydroxide (15%) and copper sulphate (1%)
protein = mauve
Lipids 1ml ethanol + liquid food (oil) + crushed up soild food (fat) + 1ml water
lipids = cloudy, white
THE LIVERS FUNCTIONS
AMINO ACIDS AND PROTEIN CONTROL
liver carries out amino acids and proteins
REMOVAL OF POISONS
liver turns the poisons into harmless substances
VITAMINS AND MINERALS
iron, copper and potassium and several vitamins
BILE PRODUCTION
the gall bladder stores bile, bile emulsafies fats in digestive system
RED BLOOD CELL BREAKDOWN
red blood cells last about 4 months, pigments turn brown this is what give faeces their colour.
PROTEIN MANUFATURE
fibrinogen, albumin and globulin
HEAT ENERGY PRODUCTION
chemical reactions in liver = heat = warmed blood = blood circulates round body and heats the rest of it up
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