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15 questions from this quiz
Chemical messengers
Directly into the bloodstream
Pituitary gland
Stimulates other glands
Insulin
Blood glucose levels
Thyroxine
Metabolic rate, heart rate, temperature
Adrenaline
Fight or flight response
Oestrogen
Menstrual cycle and sexual characteristics
Testosterone
Sperm production and sexual characteristics
Much slower but acts for longer
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