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If you see this term in a text, there are a couple of possible meanings.
Adenosine triphosphate (ATP) is a nucleoside triphosphate [2] that provides energy to drive and support many processes in living cells, such as muscle contraction, ...
ATP is the only type of usable form of chemical energy for musculoskeletal activity. It is stored in most cells, particularly in muscle cells. Other forms of chemical energy, such as those available from oxygen and food, must be transformed into ATP before they can be utilized by the muscle cells.
ATP is a molecule found only in and around living cells, and as such it gives a direct measure of biological concentration and health. ATP is quantified by measuring the light produced through its reaction with the naturally-occurring firefly enzyme luciferase using a luminometer.
In cellular biology, active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.
Adenosine triphosphate, an organic chemical used for driving biological processes . ATPase, any enzyme that makes use of adenosine triphosphate; Advanced Technology Program, US government program
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The Pannexin-1 channel is an integral component of the P2X/P2Y purinergic signaling pathway and the key contributor to pathophysiological ATP release. [17] For example, the PANX1 channel, along with ATP, purinergic receptors, and ectonucleotidases, contribute to several feedback loops during the inflammatory response. [18]