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Types of ions inside and outside the neuron
The neuron memane is a selectively permeable boundary between the cell and its environment. Charged particles (ions) can only cross this memane if there is an open pore, or channel. The fluid within the cells (intracellular fluid) and the fluid surrounding them (extracellular fluid) contain different types and concentrations of ions. Under normal (i.e., resting) conditions, most of the ions present in the intracellular fluid are potassium ions, K+. On the other hand, the extracellular fluid is rich in sodium ions (Na+) and chloride ions (Cl-).
Forces of Diffusion and Electrostatic Pressure
Purchase your paper on Oxygen andain In the absence of a barrier, diffusion takes place so as to ensure an even distribution of ions in a fluid. Each portion is not more saturated or diluted than the other. Electrostatic pressure is the force exerted by attraction (opposite charges) or repulsion (same charges) of ions. A neuron is negatively charged relative to the outside. Hence, K+ is pushed out by diffusion but kept in by electrostatic pressure. Similarly, the force of diffusion tends to push Cl- inside the neuron but is pulled away from the negative intracellular fluid by electrostatic pressure.
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