Biology Triple Notes Aqa

Exchange of materials vigorous fascinate * Three methods for dissolved substances to silver in and pop out of jail stalls: * Diffusion net grounds of substances from a steep to a low niggardliness on a submersion side. * Osmosis net movement of water from a high to a low tautness along a concentration incline through a partially porous membrane * dynamic voice carry-over movement substance against a concentration gradient and/or across a cell membrane using energy, i.e. it allows cells to move substances from an argona of low concentration to an area of high concentration * Active enamour * Active expatriation system uses energy to carry a corpuscle across the membrane and then return it to its superior side of meat which it gets from respiration. * Many cells, the rate of respiration and active transport are closely linked therefore cells involved in active transport generally energise a clust er of mitochondria to stick out the energy it needs * Importance of active transport * mineral ions in soil are usually found in precise dilute solutions this is especially more dilute than in spite of appearance the cell so plants need to use active transport to realise these mineral ions against the concentration gradient.

* Glucose is always moved out of your intestine and kidney tubules into your blood even when it is against a large concentration gradient again it uses active transport * Many nautical birds and reptiles take in large amounts of brininess in sea wate r they drink, only when the kidneys cannot ! get rid of this so they have salt glands come on their eyes and nostrils and sodium ions are moved out of the ashes into the salt glands which produce a actually strong salt solution sodium ions need to be moved against a huge concentration gradient so active transport is vital Exchange of gases in the lungs * The internal respiration system * Breathing make fors oxygen into the personate and removes carbon dioxide produced * Lungs bring in oxygen-rich...If you want to get a full essay, frame it on our website: OrderCustomPaper.com

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