Biology - Topic 5 Review 0.0 / 5 ? BiologyHomeostasisGCSEAQA Created by: Megan BaxterCreated on: 18-02-19 17:07 What is s stimulus? A change in the environment 1 of 20 What makes up the central nervous system and what does it do? Brain, spinal cord. It dectects and rects to stimuli 2 of 20 What is a synapse? The connection betweeen two neurones 3 of 20 What is the purpose of a reflex action? It reduces the chnces of injury 4 of 20 Give one thing the medulla in the brain is responsible for? Things you don't have to think about - breathing 5 of 20 What is the role of the cornea? It refracts light into the eye 6 of 20 What is the role of the iris? Contains muscles that control diameter of pupil, controls how much light enters the eye 7 of 20 What is the role of sclera? The tough, supporting wall of the eye 8 of 20 Why do we shiver when we are cold? As your muscles contract automatically 9 of 20 What is a hormone? They are chemical molecules released into the blood 10 of 20 Give two differences between nervous and hormonal responses? Nerves - fast action, act for a short time. Hormones - slow action, act for a long time 11 of 20 Where is excess glucose stored in the body? Liver and muscles 12 of 20 What effect does glycagon have on the blood glucose levels? When they are low, glycagon is added 13 of 20 Where is LH and FSH produced? Pituitary gland 14 of 20 Where is oestrogen and prpgesterone produced? Ovaries 15 of 20 What is the role of thryoxine in the body? Released for thryoid gland in neck, regulates the metabolic rate 16 of 20 What is auxin? Plant hormone that controls growth near the tips, shoots and roots 17 of 20 What is phototropism? Growth of a plant in response to light 18 of 20 What is gravitropism? Growth of a plant in response to gravity 19 of 20 Which plant hormone is responsible for fruit ripening? Ethene 20 of 20
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