Biology- homeostasis 0.0 / 5 ? BiologyHomeostasisIGCSEAQA Created by: Splash HeslinCreated on: 17-05-15 16:12 What is homeostasis? Maintenance of constant internal body conditions. 1 of 17 What are hormones? A chemical produced in glands- carry messages + coordinates different responses. 2 of 17 What does homeostasis control? Body temp, water content of body, ion content, blood glucose levels. 3 of 17 What is the kidney? Filters blood, removes urea, excess salts + water 4 of 17 What does the ADH hormone do? Causes kidneys to reabsorb water (concentrated urine)- this is if water content of blood is too low. 5 of 17 What is a negative feedback system? Keeping the water balance in blood- as water level in blood rises, it results in less ADH produced. 6 of 17 What is kidney dialysis? Filtering blood artificially, urea passed though dialysis fluid. Makes sure glucose + ions not lost. 7 of 17 What does thermoregulatory mean? Brain controls/ monitors body temp. 8 of 17 How hot internal body temp? Kept constant: 36- 38 c 9 of 17 What is vasoconstriction? CONSERVE heat. Blood vessels to the skin constrict= less blood flows through. Less energy radiated. 10 of 17 What does decreased sweating do? CONSERVE heat. Less evaporation of sweat= decrease heat loss. 11 of 17 What does shivering do? CONSERVE heat. Muscles contact-> more respiration-> release heat energy. 12 of 17 What is vasodilation? LOOSE heat. Blood vessels to skin dilate= more blood flow= more heat loss through skin. 13 of 17 What does increased sweating do? LOOSE heat. Evaporation of sweat allows increased heat loss. 14 of 17 What are insulin and glucagon examples of? Hormones. 15 of 17 Type 1 diabetes... Pancreas not produce enough insulin. Genetics. Transplant/ inject insulin. 16 of 17 Type 2 diabetes... Body cells unresponsive to insulin. Age, obesity. Loose weight, exersize. 17 of 17
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