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Anonymous users2024-02-08The resting potential is positive outside and negative inside.
The action potential is positive inside and negative outside.
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Anonymous users2024-02-07It is the outflow of potassium ions that forms the resting potential of the cell.
Because there is a large difference in the concentration of potassium ions inside and outside the cellCell membrane celeryIt is permeable to potassium ions, so potassium ions will flow out, and when the outflow reaches a certain extent, it will form a resting potential that is negative inside and positive outside, and it will cross the membrane at this timeElectric field forceIt is equal to the concentration potential energy inside and outside the potassium ions, and the transmembrane electric field force hinders the exogenous trapped flow of potassium ions, so the potassium ions no longer continue to flow, and the membrane potential is also stable, which is the formation process of the resting potential.
At the beginning, when potassium ions do not flow, there are positive and negative ions in the cell.
are equal, but the intracellular negative ions are mainly some organic negative ions (like proteins and nucleotides, which are used to maintain the electrical neutrality of the intracellular fluid.
Potassium ions have no oxidation in solution, and show very weak oxidation in the molten state, and generally do not react with other ions.
However, perchlorate ions can be combined with potassium ions to form a slightly soluble hail of potassium perchlorate precipitation, and other precipitations of potassium ions include potassium bitartrate, potassium hexachloroplatinate, potassium fluorozirconate, potassium cobalt nitrite, potassium tetraphenylborate, etc.
Flame reaction of potassium ions.
It is purple and needs to be seen through blue cobalt glass (to prevent interference by Na+), and the potassium ions in the solution are colorless.
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Anonymous users2024-02-06The resting potential refers to the potential difference between the two sides of the membrane in the quiet state of the cell, which is manifested as a negative potential in the membrane compared with the outside of the membrane, generally in the range of -100 -l0mV.
The resting potential is mainly formed by the outflow of k+, which is close to the electro-chemical equilibrium potential of k+.
The distribution of Na+ and K+ inside and outside the cell is uneven, with high Na+ outside the cell and K+ in the cell; At rest, the permeability of the membrane to K+ is much greater than that of Na+, and K+ flows out along the concentration gradient and reaches electro-chemical equilibrium.
Electrogenesis of Sodium-Potassium Pumps, Medical Education|Net collection maintains the uneven distribution of ions inside and outside the cell, increases the negative value of the intramembrane potential, and participates in the generation of resting potential.
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Anonymous users2024-02-051. Resting potential.
The permeability of the plasma membrane of animal cells to K+ is greater than that of Na+ is the main reason for the generation of resting potential, and Cl- and even protein molecules in the cell (generally with a negative net charge) also have a certain effect on the magnitude of the resting potential. The NA-K pump plays an important role in maintaining the relative constancy of the resting potential.
2. Action potential.
The formation of action potentials is entirely due to the passive diffusion of ions. However, at the end of each action potential, the amount of sodium ions within the cytoplasm was slightly higher than at rest, and the amount of potassium ions was slightly lower than at resting.
A sodium-potassium pump that works continuously will eliminate this change. In this way, although active transport is not required for the formation of action potentials, active transport is indispensable in the maintenance of ion gradients.
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