16638815
Description
Flashcards by Sea Chel Pie, updated more than 1 year ago
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Created by Sea Chel Pie
almost 6 years ago
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| Question | Answer |
| 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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