B3.2.12 (HL)—Exchange between tissue fluid and cells
Tissue fluid bathes cells and mediates diffusion of oxygen, nutrients, ions, carbon dioxide and wastes between blood and body tissues.
- Syllabus
- First assessment 2025
- Objective
- B3.2.12
- Level
- HL
Concept essentials
- Tissue fluid is the exchange medium between capillaries and body cells.
- Oxygen and nutrients diffuse from blood to tissue fluid and then into cells.
- Carbon dioxide and wastes diffuse from cells into tissue fluid.
- Tissue fluid contains fewer large proteins than blood plasma.
ConceptIB Biology HL