B3.2.13 (HL)—Lymph ducts Topic Practice
B3.2.13 (HL)—Lymph ducts Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Students practise tracing lymph flow from capillaries to veins while linking structure—valves, smooth muscle, lymph nodes—to function in fluid balance and immunity.
How this is tested
- interpret a labelled diagram of lymphatic vessels to explain how valves and skeletal muscle action drive lymph
- link lymph node structure to its role in filtering debris and initiating immune responses
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