Information about Steady State (biochemistry)
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In ionic steady state, cells maintain different internal and external concentrations of various ionic species[1]. Cell membranes are permeable to sodium and various other ions, so in order to maintain a constant ionic concentration the cell must expend energy to actively transport these ions against the electrochemical gradient, out of the cell, at the same rate as they diffuse inward. Conversely, membranes are not permeable to potassium, so this ion must be actively pumped into the cell. Sodium and potassium pumps in the membrane are thus responsible for the differences in the intracellular and extracellular concentrations of these ions. The unequal distribution of ions represents a steady state (and not an equilibrium) as it requires the continual expenditure of cellular energy. Ionic steady state is a form of homeostasis.
In ionic steady state, cells maintain different internal and external concentrations of various ionic species[1]. Cell membranes are permeable to sodium and various other ions, so in order to maintain a constant ionic concentration the cell must expend energy to actively transport these ions against the electrochemical gradient, out of the cell, at the same rate as they diffuse inward. Conversely, membranes are not permeable to potassium, so this ion must be actively pumped into the cell. Sodium and potassium pumps in the membrane are thus responsible for the differences in the intracellular and extracellular concentrations of these ions. The unequal distribution of ions represents a steady state (and not an equilibrium) as it requires the continual expenditure of cellular energy. Ionic steady state is a form of homeostasis.
References
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ion is an atom or molecule which has lost or gained one or more electrons, making it positively or negatively charged. A negatively charged ion, which has more electrons in its electron shells than it has protons in its nuclei, is known as an anion
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In cellular biology, an electrochemical gradient refers to the electrical and chemical properties across a membrane. These are often due to ion gradients, particularly proton gradients, and can represent a type of potential energy available for work in a cell.
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A dynamic equilibrium occurs when two reversible processes proceed at the same rate. Many processes (such as some chemical reactions) are reversible and when at dynamic equilibrium the forward reaction will occur at the same rate as the reverse reaction such that there is no
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Homeostasis is the property of either an open system or a closed system, especially a living organism, to regulate the state of its internal environment so as to maintain a stable, constant condition.
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