Revision Summary for Module B4 1.0 / 5 based on 1 rating ? ScienceBiologyGCSEOCR Created by: dpmCreated on: 04-05-16 23:09 What is homeostatis? Maintaining a constant internal enviroment 1 of 24 Name two things in your body that automatic control systems regulate Inputs & outputs 2 of 24 How might mountain climbing affect you blood oxygen level? Less oxygen available 3 of 24 Name the three main stages in negative feedback Receptor, response and effectors 4 of 24 What is the advantage of effectors that work antagonistically? The effectors will carry on produced responses for as long as they're stimulated by the processing centre 5 of 24 Give the definition of diffusion Gradual movement of particles from lots to few of them 6 of 24 Give two examples of chemicals that can move into cells by diffusion 02 & C02 7 of 24 What is osmosis? Diffusion of water 8 of 24 Why is it important for animal cells to regulate their water content? Cells can rupture or shrivel up, dependent if too much water is moving in or out 9 of 24 Give the definition of an enzyme Are proteins that speed up chemical reactions in cells 10 of 24 Describe the 'lock and key' model Substrate fits into the enzyme just like a key fits into a lock 11 of 24 What is a denatured enzyme? Protein is altered 12 of 24 What is the average human core body temperature? 37 c 13 of 24 Name the area of the brain that detects the temperatature of the blood Hypothalamus 14 of 24 Name two respoces the body has to high body temperature Too hot = More sweat/vasodilation Too cold = Shiver/Vasoconstriction 15 of 24 What is vasoconstriction? When your body gets too cold, blood vessels close to the skin's surface get small in diameter 16 of 24 Give an example of an effectors involvled in increasing body temperature Sweat glands 17 of 24 Name two symptoms of heat stroke Possible answers: Headaches, dizziness, nausea, vomiting, loss of appetite, confusion, disorientation and visual hallucinations 18 of 24 What is hypothermia? When your body temperature falls below 35 c 19 of 24 Give two ways water is gained by the body Drinks, food or respiration 20 of 24 What factors can affect the concentration of urine produced by the kidneys? Concerntration of the blood plasma 21 of 24 What organ released ADH? Pituitary gland 22 of 24 If there is an increase in water content will more or less ADH be released? Less 23 of 24 What effect does alcohol have on urine production? Larger amount of more dilute urine 24 of 24
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