Facilitated diffusion is usually significant to pass the ions across the hydrophobic layer of the plasma membrane. Transmembrane integral protein and careers proteins provide the channels that allow the ion to pass across the membrane. When an ion bind to their active site on the protein (note that the proteins are very selective), the protein changes conformation. It is this change in conformation opens up the channel that allows the ions to be passed across the membrane. When the ions are released inside of the cell, the protein resumes normal shape (and the channel also closes) and the active site becomes available again or another ion.
This would be an example of negative feedback because the body isn’t trying to surpass a set point. It’s trying to maintain the amount of food in the stomach at that point.
<em>Answer:</em>
<em>It is the uppermost layer of the three layers of the skin. Summarily, the epithelium is a more general concept, and epidermis is the one type of epithelium, which is a more limited word indicating exterior part of the skin.</em>
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<em>Explanation:</em>
<em>*Hope this helps*</em>
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