The A.1.1 Inter-system communication section is part of the International Baccalaureate (IB) Sports, exercise and health science SL and HL course and covers key learning outcomes required for both SL and HL students. This topic introduces A.1.1.1 The nervous system and physiological response coordination and A.1.1.2 The endocrine system and regulation of biological processes, providing the foundation for success in Papers Paper 1, Paper 2, and Paper 3.

On this page, you'll find everything you need to master A.1.1 Inter-system communication. The International Baccalaureate (IB)-style Question Bank provides exam-style practice questions with detailed, step-by-step solutions. Our Interactive Flashcards are designed for fast revision of formulas, definitions, and International Baccalaureate (IB)-specific terminology. For deeper understanding, Step-by-Step Lessons guide you through worked examples aligned with the International Baccalaureate (IB) syllabus. If you prefer to learn visually, our Engaging Video Tutorials break down complex concepts in a clear and accessible way. Finally, the Concise Notes offer syllabus-aligned summaries, perfect for last-minute study sessions or quick review before exams.