6.1 Exchange between organisms and their environment

Descripción

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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