Biology · GCSE
The Body Holds Its Line
How a body detects a change and reverses it, and why every one of these systems works the same way. Nerves and the reflex arc; the brain; hormones, with the menstrual cycle drawn as four hormones across 28 days, contraception and fertility treatment; the eye and its defects; the four values the body will not let go — temperature, glucose with insulin and glucagon, water, and plant hormones — and the negative-feedback loop that runs all of it. Sixteen terms to define, a model answer on blood glucose, and the misconceptions that cost marks.
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