B1 Staying in balance 0.0 / 5 ? BiologyHomeostasis, Temperature control, Control of blood sugar levelsGCSEOCR Created by: Nicole10Created on: 17-11-15 20:59 Whats is Homeostasis and what does it involve? Homeostasis: Keeping constant internal environment. Involves balancing bodily inputs and outputs 1 of 18 What keeps the level temperature, water and carbon dioxide steady? Automatic control systems 2 of 18 What do negative feedback systems do? They act when conditions change from the ideal or set point and returns conditions back to this set point 3 of 18 The body temperature is... 37 degrees celsuis 4 of 18 A high temperature can cause... 1) Heat stroke (pulse is rapid but weak) 2) Dehydration 5 of 18 What does the body do to avoid overheating? The body sweats to increase heat transfer from the body to the environment 6 of 18 Why does the evaporation of sweat require body heat? To change the liquid sweat into water vapour 7 of 18 A very low temperature can cause... Hypothermia (pulse is slow with violent shivering) 8 of 18 What is blood temperature monitored by? The hypothalamus gland in the brain 9 of 18 Reaction to temperature extremes are controlled by... The nervous and hormonal systems - these trigger vasoconstriction or vasodilation 10 of 18 What happens during Vasoconstriction? Body too cold -> small blood vessels narrow -> less blood flow -> heat loss reduced 11 of 18 What happens during Vasodilation? Body too hot -> small blood vessels widen -> blood flow increases -> more blood flow near skin surface -> more heat transfer (heat is lost) 12 of 18 Which hormone controls blood sugar levels? Insulin 13 of 18 Is hormone action slower or nervous reactions? Why? Hormone action because hormones travel in the blood 14 of 18 What is Type 1 diabetes caused by and how is it treated/controlled? Caused by the pancreas not producing any insulin. Treated by doses of insulin 15 of 18 What is Type 2 diabetes caused by and how is it treated/controlled? Caused by body producing too little insulin or body not reacting to it. Controlled by diet 16 of 18 Blood sugar level is regulated by... Glycogen (stored in the liver) that has been converted, from excess glucose in the blood, by insulin 17 of 18 Insulin dosage for strenuous exercise... Lower dose of insulin required as more glucose needs to be present in the blood 18 of 18
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