B5 - Homeostatis 4.0 / 5 based on 1 rating ? BiologyHomeostasisGCSEAQA Created by: emilym2244Created on: 26-03-18 15:48 What is homeostasis? Mainting a stable internal environment in the body 1 of 17 Why is it important for the conditions inside the body to be kept steady? Your cells need the right conditions to function properly (including the right conditions for enzyme action) 2 of 17 What is the correct temperature of the inside of the body? 37 degrees 3 of 17 What happens to the body when you are too hot? Sweat produced by sweat glands, blood vessels dilate (vasodilation) 4 of 17 What happens to the body when you are too cold? Hairs stand up, no sweat, capillaries constrict (vasoconstriction), shiver 5 of 17 What is produced in the pituitary gland? Many hormones that regulate body conditions and act on other glands, directing them to release hormones that bring about change 6 of 17 What is produced in the ovaries? Oestrogen, which is involved in the menstrual cycle 7 of 17 What is produced in the testes? Testosterone, which controls puberty and sperm production in males 8 of 17 What is produced in the thyroid? Thyroxine, which is involved in regulating metabolism, heart rate and temperature 9 of 17 What is produced in the adrenal gland? Adrenaline, which is used to prepare the body for a 'fight or flight' response 10 of 17 What is produced in the pancreas? Insulin, to regulate the blood gluscose level 11 of 17 What happens when blood glucose levels are too high? Insulin is secreted by the pancreas, which makes the liver turn glucose into glycogen 12 of 17 What happens when blood glucose levels are too low? Glucagon is secreted by the pancreas, which makes the liver turn glycogen into glucose 13 of 17 What happens in type 1 diabetes? The pancreas produces little or no insulin 14 of 17 What happens in type 2 diabetes? The person becomes resistant to their own insulin 15 of 17 What substances are removed from the blood in urine? Urea (proteins, ammonia), ions (e.g. sodium) and water 16 of 17 What substances are reabsorbed back into the blood by selective reabsorption after filtration in the kidneys? Glucose, some ions and the right amount of water 17 of 17
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