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  2. OCR A, A-level Biology Module 3 Summary

OCR A, A-level Biology Module 3 Summary

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Transport & Exchange Systems Summary 1. Need for Transport: Multicellular organisms need specialised systems due to high metabolic demand and low SA:V ratio. 2. Circulatory Systems: Open (e.g. insects), closed, single, and double circulation types. 3. Blood Vessels: Arteries: Thick, elastic walls; carry blood away. Veins: Thin walls, valves; carry blood to the heart. Capillaries: Thin walls for exchange. 4. Blood & Tissue Fluid: Blood transports gases, nutrients, wastes. T...

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  • Exam (elaborations)
  •  • 6 pages's • 
  • by SCOTTTORRES • 
  • uploaded  2025
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