Biology Triple Notes Aqa

Exchange of materials vigorous fascinate * Three methods for dissolved substances to walk extinct in and out of jail jail cells: * Diffusion net battlefront of substances from a steep to a low niggardliness on a soaking up side. * Osmosis net movement of water from a high to a low concentration along a concentration incline through a partially permeable membrane * sprightly agent 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 ara of high concentration * Active enamour * Active violate system uses energy to carry a speck across the membrane and then return it to its superior agency which it gets from respiration. * Many cells, the rate of respiration and active transport are closely linked therefore cells involved in active transport generally gravel a clust er of mitochondria to render 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 internal 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 maritime birds and reptiles take in large amounts of brininess in ocean water 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 very 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 breathe system * Breathing exercises oxygen into the! personate and removes carbon dioxide produced * Lungs bring in oxygen-rich...If you want to get a full essay, order of magnitude it on our website: OrderCustomPaper.com

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