GCSE Biology AQA - Thyroxine & Adrenaline | Hormone Functions [2026 exams]

-Video required for Higher Tier only (in both Combined and Triple Science) This video covers AQA Biology syllabus section 4.5.3.7 (Negative feedback - Higher Tier only). We'll explore the roles of two key hormones: adrenaline's function in preparing the body for 'flight or fight' responses by increasing heart rate and delivering oxygen and glucose to vital organs, and thyroxine's role in stimulating basal metabolic rate and supporting growth and development. The video explains how thyroxine levels are regulated through negative feedback mechanisms to maintain homeostasis. www.learnwithascientist.com Timestamps: 00:00 Introduction and topics overview 00:25 Adrenaline: emergency hormone overview 01:30 Thyroxine: metabolism regulation 02:18 Negative feedback: hormone control 03:28 Homeostasis and closing remarks All of Paper 2 Playlist:    • GCSE Biology AQA - All of Paper 2 (Topics ...   #GCSE #science #biology #aqa #revision #learn #thyroxine #adrenaline #thyroid #adrenalglands