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Active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration—in the direction against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport – primary active ...


Electrochemical gradients and the membrane potential. Primary and secondary active transport. Na+/K+ pump.

Sep 22, 2014 ... Learn about the three types of active transport in this video.


Active transport mechanisms require the use of the cell's energy, usually in the form of adenosine triphosphate (ATP). If a substance must move into the cell against its concentration gradient, that is, if the concentration of the substance inside the cell must be greater than its concentration in the extracellular fluid, the cell must ...


Biology4Kids.com! This tutorial introduces active transport in cells. Other sections include plants, animal systems, vertebrates, and microorganisms.


Aug 27, 2017 ... Definition. noun. A kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion – or – movement from an area of lower concentration to an area of higher concentration. Hence, this process will require expenditure of ...


What is active transport process? How does it take place in a cell? Read on to know the answer to these questions.


Active Transport Definition. To sustain life, many substances need to be transported into, out of, and between cells. In some cases, this can be accomplished through passive transport, which uses no energy. In many cases, however, the cell needs to transport something against its concentration gradient. In these cases ...


Active transport - Higher. Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient - and therefore require an input of energy from the cell. Sometimes dissolved molecules are at a ...