Glossary of Physiology Terms – O
Refers to an abnormally low volume of urine production. Generally, a urine production rate of less than 400 mL/day is referred to as oliguria.
Related glossary terms/phrases:Polyuria
Other resources:Oliguria (Wikipedia)
Organ of Corti
Auditory sensory organ within the inner ear cochlea
, where the inner and outer hair cells are located.
Related glossary terms/phrases:Cochlea
Otoacoustic emissions (OAE) are sounds that arise from the organ of Corti within the cochlea of the inner ear in response to sound stimulation. They are thought to result from vibrations of cochlear outer hair cells (OHC) in response to stimulation by sound. Otoacoustic emissions are inaudible to the human ear, but can be recorded by placing a small recording device in the external auditory meatus (ear canal).
Otoacoustic emissions have clinical diagnostic value and are measured as part of hearing exams. In the newborn, otoacoustic emissions are recorded in order to detect blockage in the middle ear cavity (e.g., as a result of fluid accumulation) or external ear canal.
Ouabain binds to and inhibits the transport activity of the Na+
/ATPase (i.e., sodium pump).
Ouabain is plant derived and belongs to the class of drugs referred to as cardiac glycosides. Similar to other cardiac glycosides, ouabain increase heart muscle contractility. However, ouabain is used only experimentally and not in humans (as for example digoxin is for the treatment of congestive heart failure).
There is some evidence that ouabain may be produced endogenously in humans.
Related glossary terms/phrases:Vanadate
Other resources:Ouabain (Wikipedia)
Surgical removal of one or both ovaries.
Also known as oophorectomy
Related glossary terms/phrases:Oophorectomy
Body weight that exceeds the normal or standard weight range. The standard range is generally determined based on height and frame size.
Related glossary terms/phrases:Body Mass Index
See also:Body Mass Index Calculator
Posted: Sunday, November 28, 2010
Last updated: Sunday, January 10, 2016