6.1 Exchange between organisms and their environment

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GCSE (Organisms Exchange Substances with their Environment) Biology Fichas sobre 6.1 Exchange between organisms and their environment, creado por Sea Chel Pie el 04/02/2019.
Sea Chel Pie
Fichas por Sea Chel Pie, actualizado hace más de 1 año
Sea Chel Pie
Creado por Sea Chel Pie hace casi 6 años
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Resumen del Recurso

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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