Exchange of materials (Edexcel GCSE Biology Combined Science): Flashcards
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Why oxygen is needed by organisms
Why oxygen is needed by organisms
Aerobic respiration (releases energy for cells)
What is urea
What is urea
Waste from amino acid breakdown in liver
Why unicellular organisms don't need transport systems
Why unicellular organisms don't need transport systems
Large SA:V ratio; diffusion through membrane is sufficient
Why multicellular organisms need specialised systems
Why multicellular organisms need specialised systems
Smaller SA:V ratio; diffusion alone insufficient
Transport system in animals
Transport system in animals
Circulatory system (blood carries substances)
Function of xylem in plants
Function of xylem in plants
Transports water & mineral ions from roots
Function of phloem in plants
Function of phloem in plants
Transports sugars & amino acids from leaves
Function of villi in small intestine
Function of villi in small intestine
Absorb dissolved food molecules into bloodstream
Function of stomata in leaves
Function of stomata in leaves
Gas exchange (O₂ and CO₂ move in/out)
SA:V ratio formula
SA:V ratio formula
Surface Area ÷ Volume