Concentration of Solutions and Tonicity

This second discussion of an important topic in Anatomy and Physiology will cover concentration of solutions – in other words, does the cell shrink or burst, or neither, when placed in different solutions? Tonicity is the concept governing the answer to this commonly asked question. The first thing to realize here is that we onlyContinue reading “Concentration of Solutions and Tonicity”

Na-K Pump: Active Transport

Active Transport is active (as opposed to passive) because it uses chemical energy released by breaking off one inorganic phosphate from ATP. In the case of the Na-K Pump, that energy is used to change the shape of the membrane transport protein, thus dumping out 3 Na+ ions. This movement of sodium out of theContinue reading “Na-K Pump: Active Transport”

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