GCSE›Edexcel GCSE Biology›Mind mapsAnimal HormonesEdexcel GCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsGlandsHormones are secreted into the bloodPituitary: master gland, TSH, FSH, LHThyroid: thyroxinePancreas: insulin, glucagonOvaries: oestrogen, progesteroneTestes: testosteroneFight or flightAdrenal glands release adrenalinHeart rate and blood pressure riseMore blood flow to musclesLiver turns glycogen into glucoseThyroxine feedbackLow thyroxine: hypothalamus releases TRHPituitary releases TSHThyroid releases thyroxineNormal levels inhibit TRH and TSHHormonesin animalsFSHLHTSHMenstrual cycleFSH matures egg, stimulates oestrogenOestrogen repairs uterus liningOestrogen triggers LH surgeLH triggers ovulationProgesterone maintains liningFalling progesterone causes menstruationFertility controlHormonal contraception inhibits FSHBarrier methods block sperm, prevent STIsClomifene stimulates FSH and LHIVF: eggs fertilised outside bodyExam tipsNegative feedback: low level triggers, normal level switches offOestrogen triggers the LH surge, LH triggers ovulationName the target organ for each hormone