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Short answer Facilitated diffusion is a passive process in which membrane channels mediate the transport of polar, or big molecules that are not solvable in the cell membrane. Co-transport, on the other hand, is active transport, as it depends on the electrochemical gradient of ions across the cell's membrane, particularly Na+. Because ATP or other energetic ...


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"Specifically, what is the difference between facilitated diffusion carrier processes (passive) and secondary active transport co-transport processes (active)?" Facilitated diffusion creates alternative paths for polar/charged substances to move down their electrochemical gradients across the hydrophobic interior of the membrane, thus greatly speeding up ...


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Actually there is fatty acid transport through the BBB. Maybe the rate of this transport is not enough, I don't know, I think it does not really matter. What really happens here, that the liver prepares the fatty acids, so the brain can use them more easily in the form of ketoacids to produce energy. fatty acid catabolism shared between the liver and ...


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Human body is a glucose driven machine which intake carbohydrates and converts to glucose. Energy is yielded from the glucose and glucose is stored as glycogen. When the carbohydrate intake is somehow reduced then body will shift its mechanism and uses the fatty acids to produce energy. Liver synthesis ketones from fatty acids in our diet or from body fat. ...


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Gluconeogenesis is not the reversal of the glycolysis, but the generation of glucose from non-carbohydrate precursors (like odd chain fatty acids and proteins). The reason why we have this process is because some organs and tissues can only use glucose as their energy source. These include the brain (although ketone bodies can be used here as well), ...



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