Creado por Sea Chel Pie
hace casi 6 años
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Pregunta | Respuesta |
what is Tissue Fluid ? | the environment around the cells of multi cellular organisms |
what effects amount of each substance that is exchanged ? | Size Metabolic Rate |
what happens when an organism has a High Metabolic Rate | ~ exchange More materials ~ Need Large SA:V ration -> reflected in type of Exchange surface and Transport system ( to meet requirements ) |
what Substances need to be Interchanged between organism and environment | ~ Respiratory gases (O2, CO2) ~ Nutrients (Glucose, fatty acids, vitamins) ~ Excretory products (Urea & CO2) ~ heat |
Surface Area : Volume | exchange surface must be large compared to Volume -> to allow sufficient exchange |
what features must organisms develop ? | 1. Flattened shape -> no cell is Never Far from surface -> e.g flatworm , eaf 2. Specialised exchange surface -> Large area, to increase SA:V ratio -> e.g lungs in mammals, gills in fish |
how are Specialised exchange Surfaces by diffusion/ active Transport Adapted ? 1 | ~ Large SA:V ratio -> increases Rate of Exchange ~ Very thin, diffusion pathway short -> materials cross surface rapidly ~ Selectively Permeable, selected stuff to cross |
how are Specialised exchange Surfaces by diffusion/ active Transport Adapted ? 2 | ~ Movement of external environmental medium e.g air flow -> maintain Diffusion gradient ~ a Transport system, to ensure Movement of Internal enviroment -> e.g blood flow to maintain diffusion gradient |
Diffusion equation? |
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