Master Topic B3 of OCR Gateway Combined Science A (J250): the nervous system and reflex actions, receptors and the eye, the endocrine system and hormones, control of blood glucose and diabetes, maintaining body temperature and water balance, and hormones in human reproduction. Exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Plant hormones, kidney anatomy and brain-region detail are separate-science only and are not covered.)
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