…The concentration gradient of these two ions is maintained by the constant active transport of these ions against the difference in electrochemical potential between the two ions (this is called active transport). In general, the active transport mechanism that directly uses the chemical energy of ATP to pump out and take up ions is called an ion pump. In animal cells, there is a cation transport system in the cell membrane that actively pumps out Na + and takes up K + using ATP as an energy source, and this is specifically called the sodium pump. … From [Active transport]…Skeletal muscle contraction is brought about by more than 10 −6 mol of calcium ions Ca 2+ , which is the release of about 10 −3 mol of Ca 2+ stored in the sarcoplasmic reticulum membrane. This depends on an active transport process (called an ion pump) that uses the chemical energy of ATP to transport ions (sodium pump) by enzymes called Na + , K + -ATPase, H + -ATPase, and Ca 2+ -ATPase. This type of transport that is completely coupled with energy supply such as ATP hydrolysis is called primary active transport. … *Some terminology that mentions "ion pump" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この両イオンの濃度こう配は,両イオンの電気化学的ポテンシャル差に抗して,絶えず能動的にこれらイオンを輸送することによって維持されている(これを能動輸送という)。一般にATPの化学エネルギーを直接的に利用してイオンをくみ出したり,取り込む能動輸送の機構をイオンポンプion pumpと呼ぶ。動物細胞では細胞膜に,ATPをエネルギー源として能動的にNa+をくみ出しK+を取り込むカチオン輸送系が存在しており,これを特にナトリウムポンプと呼ぶ。… 【能動輸送】より…骨格筋の収縮は10-6mol以上のカルシウムイオンCa2+によってもたらされるが,これは筋小胞体膜に10-3mol程度に蓄積されたCa2+が放出されることによる。これらは,Na+,K+‐ATPアーゼ,H+‐ATPアーゼ,Ca2+‐ATPアーゼと呼ばれる酵素により,ATPの有する化学エネルギーを利用してイオンを運ぶ能動輸送過程(イオンポンプion pumpという)に依存している(ナトリウムポンプ)。このようにATPの加水分解などのエネルギー供与と完全に共役した輸送を第一次能動輸送と呼ぶ。… ※「ion pump」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
>>: Ion neutralization spectroscopy
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