B3.2.13 (HL)—Lymph ducts
Lymph ducts return excess tissue fluid to blood, using valves, body movement and lymph nodes to maintain fluid balance and immune surveillance.
- Syllabus
- First assessment 2025
- Objective
- B3.2.13
- Level
- HL
Concept essentials
- Lymph capillaries collect excess tissue fluid that does not return directly to blood capillaries.
- Lymph vessels use valves to maintain one-way flow at low pressure.
- Body movement and smooth muscle contraction help move lymph through ducts.
- Lymph nodes filter lymph and contain immune cells.
ConceptIB Biology HL