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Glossary of Physiology Terms – V
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Vanadate
Definition:
An inhibitor of the Na+/K+/ATPase (i.e., sodium pump). The form commonly used for this purpose is sodium orthovanadate.

Related glossary terms/phrases:
Ouabain



Venesection
Definition:
Removal of approximately a pint of blood in a manner similar to that for donating blood. The procedure is generally used as a simple measure to reduce the number of circulating red blood cells (e.g., to treat polycythemia) or to reduce the amount of circulating iron (e.g., to treat hemochromatosis). The procedure may be repeated as needed.

It falls under procedures referred to as phlebotomy (removing blood for therapeutic or diagnostic purposes) or bloodletting (removing blood for therapeutic purposes).



Voltage clamp
Definition:
An electrophysiological technique in which the voltage of a cell membrane is controlled experimentally, and the current passing across the membrane is measured.

Related glossary terms/phrases:
Current clamp

See also:
Neuronal Action Potential - Pharmacological Inhibition of Na+ and K+ Channels



Voltage
Definition:
The difference in electrical potential between two points.









Posted: Saturday, March 30, 2013
Last updated: Sunday, March 2, 2014