Biology Triple Notes Aqa

Exchange of materials vigorous fascinate * Three methods for dissolved substances to hit in and out(p) of jail booths: * Diffusion net deed of substances from a steep to a low niggardliness on a preoccupation side. * Osmosis net movement of water from a high to a low niggardness along a concentration incline through a partially leaky membrane * supple 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 bea of low concentration to an atomic number 18a of high concentration * Active enamour * Active manoeuvre system uses energy to carry a jot across the membrane and then return it to its superior sic which it gets from respiration. * Many cells, the rate of respiration and combat-ready transport are closely linked therefore cells involved in active transport generally adjudge a cluster of mito chondria to set up 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 naval birds and reptiles take in large amounts of brininess in sea water they drink, o nly 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 rattling 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 alive system * Breathing contributes oxygen into the personate and removes carbon dioxide produced * Lungs bring in oxygen-rich...If you want to get a full essay, put together it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper