Biology: Year 10 Term 3: Negative Feedback & Hormones 0.0 / 5 ? BiologyHomeostasisNervous system, hormones and behaviourGCSEAQA Created by: Charlotte HerondaleCreated on: 19-02-19 13:25 Define 'negative feedback' (2) Response to conditions changing from usual levels, Continuous cycle between normal/high/low levels 1 of 12 What detects the rise/fall of certain levels? (1) Receptors 2 of 12 How do levels rise and fall? (2) Continuous cycle of fluctuation between higher/lower limits 3 of 12 What is the job of adrenaline and from where is it released? (3) Coordinates fight/flight response in stressful situations, Adrenal glands 4 of 12 What stimulates the glands to produce adrenaline? (1) Hypothalamus 5 of 12 What does this do to the blood? (1) Increases blood adrenaline levels 6 of 12 What does the body then do? (1) React to get rid of the stimulus 7 of 12 What then stops and what happens in the blood? (3) Hypothalamus stimulation, Secretion, Blood adrenaline lowers 8 of 12 What is the job of thyroxine and from where is it released? (3) Regulates basal metabolic rate (speed of chemical reactions at rest), Regulates protein synthesis, Thyroid gland 9 of 12 What is used to make thyroxine? (1) Iodine 10 of 12 What does thyroxine respond to and where does this come from? (2) TSH, Pituitary gland 11 of 12 What happens if BMR is too high? (1) TSH inhibited 12 of 12
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