Definitions for active transport
This page provides all possible meanings and translations of the word active transport
Random House Webster's College Dictionary
the movement of ions or molecules across a cellular membrane from a lower to a higher concentration.
Category: Biochemistry, Chemistry, Physiology
Origin of active transport:
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
Active transport is the movement of all types of molecules across a cell membrane against its concentration gradient. In all cells, this is usually concerned with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. If the process uses chemical energy, such as from adenosine triphosphate, it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient. Active transport uses cellular energy, unlike passive transport, which does not use cellular energy. Active transport is a good example of a process for which cells require energy. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
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"active transport." Definitions.net. STANDS4 LLC, 2014. Web. 11 Mar. 2014. <http://www.definitions.net/definition/active transport>.