- IB DP HL Biology
- Objectives: B2.3.6 and B2.3.7
- A3 Revision Summary
- WORD (for editing) and PDF files.
B2.3.6 Surface area-to-volume ratios and constraints on cell size: understand the mathematical ratio between volume and surface area and that exchange of materials across a cell surface depends on its area whereas the need for exchange depends on cell volume.
B2.3.7 (HL) Adaptations to increase surface area-to-volume ratios of cells: include flattening of cells, microvilli, and invagination.
Use erythrocytes and proximal convoluted tubule cells in the nephron as examples.
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