explain facilitated diffusion
Answers
Explanation:
The driving force behind diffusion of fluids is simply the probability behind Brownian motion. All molecules have some degree of erratic, random movement, largely dependent on temperature. As temperature increases, the energy of these molecules increases.
When a substance is highly concentrated in a certain region, molecular movement, especially at the periphery, will lead to the gradual spread of the substance. When all the molecules within the region are moving randomly, some are bound to move outwards, into a region where its concentration is low. On the other hand, it is less likely that random molecular movement will result in the directional movement from a region of low concentration specifically towards regions of high concentration.
For instance, when someone walks into a room wearing a strong perfume, the odorous molecules diffuse outwards, from the skin or clothes. The people in the room perceive some of these randomly moving molecules when they trigger the sensory receptors in the nose. When there is a high density of scented molecules in a region, there is a chance that a few will move away due to the innate kinetic energy of these molecules. However, the likelihood that these few stray molecules will move in a directed manner, back towards the sleeve or cuff of the person wearing the perfume is relatively small. The end result is a cloud of progressively decreasing concentration away from the person wearing the perfume
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Facilitated diffusion is a form of facilitated transport involving the passive movement of molecules along their concentration gradient, guided by the presence of another molecule – usually an integral membrane protein forming a pore or channel..
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