AQA 7402 Section 3.3 — surface area to volume ratio, gas exchange in single-celled organisms / insects / fish / plants / mammals, digestion and absorption, mammalian heart and cardiac cycle, haemoglobin and oxygen transport (with Bohr shift and fetal Hb), blood vessels and tissue fluid formation, xylem water transport and transpiration (potometer practical anchored), phloem and translocation by mass flow. Built from scratch in Phase 2 to address the spec 3.3 gap identified in the AQA Biology architecture audit.
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