IB Diploma Biology HL, topic C3
Organisms (Interaction and interdependence)
How the parts of a multicellular organism work together, and how the body defends itself against pathogens. Nerves, hormones and the blood integrate organs into one system, feedback loops regulate heart rate and ventilation, and at HL phytohormones coordinate plant growth. The second topic covers primary defences, innate and adaptive immunity, HIV, antibiotics, zoonoses, vaccines and herd immunity.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each.
- 1Integration of body systems Spec C3.1IB Biology C3.1: system integration, nerves and hormones, the brain and spinal cord, reflex arcs, feedback control and (HL) plant phytohormones.NotesQuestions 8Flashcards 28
- 2Defence against disease Spec C3.2IB Biology C3.2: pathogens, skin and clotting, innate and adaptive immunity, HIV, antibiotics, zoonoses, vaccines, herd immunity and COVID-19 data.NotesQuestions 8Flashcards 23
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.