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active vs. passive transport

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the smallest unit of life is the cell in order for life to be stained nutrients and gases must be able to pass into a cell wastes and other products must be able to pass out of the cell many of the materials that pass in or out of the wow do so by passive transport in this process there is no energy no ATP expenditure by the cell concentration gradients allow for the movement of cereal  osmosis and dialysis both specific types of passive transport use this concentration gradient of high to low another type of passive transport is to Sylhet ated diffusion since it is passive the high to low concentration gradient is present however the process facilitated by a carrier protein carrier protein is somewhat like a revolving door allowing easy access across the membrane and then rotating back to the other all of these processes ozzmosis dialysis and facilitated diffusion are passive the sale does not have to use energy to move materials by these methods the concentration gradient is used however there are materials that need to be moved against their concentration radiant this process requires energy ATP and protein carriers that are found in the plasma membrane Define active transport is material moved from a low concentration to high concentration through a membrane using a protein bear that requires ATP  an example of active transport is the mechanism of uptake of iodine by the thyroid gland when is essential for the manufacture of hormones that influence body metabolism when you eat a meal containing iodine the iodine will pass from the small intestine into circulatory system as the capillaries passed through the thyroid gland iodine diffuses out of the circulatory system iodine attaches to protein bears in the thyroid cells plasma membrane proteins they have a unique shape so only iodine will fit glucose which is also actively according to the cell relies on a different protein receptor the energy required is somewhat analogous to a rock being pushed uphill  the pro prices of simple diffusion osmosis and dialysis facilitated diffusion and active transport allow for most all of the small material those then plasma and extracellular fluid to pass in or out of the cell  large particles however pass into the cell endocytosis this is an active process it needs ATP in this process the plasma membrane surrounds the particle such as bacteria or what's Marshall and forms a vesicle that pinches off from the membrane the cell does this in two different ways one way is called the cytosis in this method of cell eating large particles are surrounded when the sale extends the plasma membrane and engulfs the particle the result remembering down package of material fluids that the cell wants to take in enter by a process called pinocytosis what type of endocytosis the cell membrane sinks in the material sinks in word and the membrane pinches off the cell uses energy this movement  can both types of endocytosis the sale ends up with a membrane-bound vesicle the material and the vesicle still has to pass through the membrane in order to be used by the cell in this case the lysosome joins with the vesicle and digestive enzymes break down the material to particle small stop the pass through the membrane and into the cytosol a specialized endocytosis called receptor-mediated endocytosis also occurs in sales in this process molecules of a particular substance such as cholesterol bind to receptors in the plasma membrane  the vesicle is formed as a membrane sinks then a lysosome joins the vesicle and the digestive enzymes break down the substance releasing it from The receptors the substance diffuses into the cytoplasm the lysosome reforms and the vesicle with now empty receptors becomes part of the plasma membrane again  this allows for the cell to reuse or recycle The receptors the function of some cells is to manufacture or synthesize materials for export in many cases this material is made up of large molecules like proteins but cannot pass through the plasma membrane the process of exocytosis and able to sell to pass this material out of the cell the cell is a very Dynamic living entity it is essential that materials move in and out of the cell this is done by passive transport using a constant ingredient and active transport endocytosis and exocytosis using ATP

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active vs. passive transport

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