IGCSE›Oxford AQA IGCSE Biology›Mind mapsHomeostasisOxford AQA IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhy it mattersKeeps internal environment constantTemperature, glucose and water contentLets enzymes work at maximum rateWorks by negative feedbackTemperatureHypothalamus detects changesHot: sweating and vasodilationCold: shivering and vasoconstrictionSweat evaporating removes latent heatVasodilation: more blood to skin surfaceBlood glucosePancreas monitors glucoseHigh glucose: insulin releasedInsulin raises cell uptake and storageLow glucose: glucagon breaks down glycogenHomeostasisconstant internal state37°CKidneyUltrafiltration: pressure forces small molecules outSelective reabsorption: active transport of useful substancesUreter carries urine to bladderADH acts on the collecting ductKidney failureDialysis: membrane removes waste, frequent visitsTransplant: full function restoredTransplant needs immunosuppressantsChoice depends on age, health, donorExam tipsInsulin increases uptake, it does not remove glucoseFiltration is non-selective; reabsorption is selectiveGive the full pathway, then negative feedbackCompare dialysis and transplant with both sides