Diffusion in Multicellular Organisms (AQA GCSE Biology): Flashcards
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Practise the cards
14 cards from this deck
Why diffusion is insufficient in large organisms
Why diffusion is insufficient in large organisms
Slow & inefficient over long distances
SA:V ratio change as organisms grow
SA:V ratio change as organisms grow
Volume increases faster than surface area
Specialised structures enhancing diffusion
Specialised structures enhancing diffusion
Lungs, gills, intestines
Large SA structures in lungs
Large SA structures in lungs
Alveoli
Large SA structures in intestines
Large SA structures in intestines
Villi and microvilli
Effect of thin membranes on diffusion
Effect of thin membranes on diffusion
Reduce distance, speed up process
Role of rich blood supply at exchange surfaces
Role of rich blood supply at exchange surfaces
Quickly transport substances to/from cells
How ventilation maintains concentration gradients
How ventilation maintains concentration gradients
Brings in fresh , removes
diffusion direction in lungs
diffusion direction in lungs
From alveoli into blood
diffusion direction in lungs
diffusion direction in lungs
From blood into alveoli
Waste product removed by diffusion in kidneys
Waste product removed by diffusion in kidneys
Urea
Transport system complementing diffusion
Transport system complementing diffusion
Circulatory system
What circulatory system transports
What circulatory system transports
Oxygen, nutrients, waste products
Key processes relying on diffusion
Key processes relying on diffusion
Respiration, nutrient uptake, waste removal