Diffusion in Multicellular Organisms (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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12 cards from this deck
Why is diffusion problematic in large organisms?
Why is diffusion problematic in large organisms?
Slow & inefficient over long distances
SA:V ratio issue as organisms grow larger
SA:V ratio issue as organisms grow larger
Volume increases faster than surface area
Structures that enhance diffusion efficiency
Structures that enhance diffusion efficiency
Lungs, gills, intestines
Role of large surface area in diffusion
Role of large surface area in diffusion
Provides more area for diffusion (e.g. alveoli, villi)
How thin membranes help diffusion
How thin membranes help diffusion
Reduce distance, speed up process
Purpose of rich blood supply near exchange surfaces
Purpose of rich blood supply near exchange surfaces
Transports substances quickly to/from cells
Role of ventilation in lungs
Role of ventilation in lungs
Maintains concentration gradients
Gas exchange in alveoli
Gas exchange in alveoli
O2 in, CO2 out via large SA & thin walls
Function of villi & microvilli
Function of villi & microvilli
Increase SA for nutrient absorption
Waste product removed by diffusion in kidneys
Waste product removed by diffusion in kidneys
Urea
Role of circulatory system in multicellular organisms
Role of circulatory system in multicellular organisms
Transports O2, nutrients, waste; complements diffusion
Key processes requiring diffusion in cells
Key processes requiring diffusion in cells
Respiration, nutrient uptake, waste removal