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ion pump |
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ion pump, n a complex of proteins located in the cell membrane that is responsible for actively transporting ions across the membrane against a concentration gradient using energy rich ATP molecules. Functions in maintaining osmotic balance in cells and in the conduction of nerve impulses. See also ATP. ion an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost one or more electrons. Substances forming ions are electrolytes. ion channel see channel. dipolar ion zwitterion. hydrogen ion the positively charged hydrogen atom (H+), present to excess in acid solutions. ion pair the pair of ions created when an atom has had an electron removed by ionizing radiation. ion trapping a strategy for treatment of poisonings based on the principle that cell membranes are less permeable to ionized compounds. With knowledge of the characteristics of the toxin, treatment can be given to alter the acid-base balance in favor of ionization. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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]-ATPase and other ion pumps and channels unevenly. Conversely, a shortage of nourishment or oxygen in the brain causes ATP formation to cease and the ion pump to close down, ending all nerve impulses and rapidly resulting in unconsciousness. Many other ion pumps have since been discovered, including the enzymes responsible for muscle contraction and the production of stomach acid. |
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