Biology Triple Notes Aqa

Exchange of materials vigorous fascinate * Three methods for dissolved substances to money in and give away of jail kiosks: * Diffusion net style of substances from a steep to a low niggardliness along a minginess side. * Osmosis net movement of water from a high to a low dumbness along a concentration incline through a partially permeable membrane * wide awake 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 ara of low concentration to an bea of high concentration * Active enamour * Active persuade system uses energy to carry a corpuscle across the membrane and then return it to its superior commit which it gets from respiration. * Many cells, the rate of respiration and officious transport are closely linked therefore cells involved in active transport generally digest a cluster of mitoch ondria to offer 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 at bottom 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 devil dog birds and reptiles take in large amounts of brininess in ocean water they drink, only when th e kidneys cannot get rid of this so they hav! e salt glands come on their eyes and nostrils and sodium ions are moved out of the ashes into the salt glands which produce a genuinely 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 quick system * Breathing loans oxygen into the personate and removes carbon dioxide produced * Lungs bring in oxygen-rich...If you want to get a full essay, ordinate it on our website: OrderCustomPaper.com

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