Author: Glossary
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Vagal maneuver
Any physical action that increases parasympathetic tone and decreases the conduction of the electrical impulses of the heart. Vagal maneuvers may be used as first-line interventions in the evaluation or management of supraventricular tachycardias. Examples include bearing down or straining; massaging the carotid sinus; coughing; gagging; or immersing the face or neck in ice water.…
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Vagabond’s disease
Discoloration of the skin caused by exposure and scratching owing to the presence of lice.
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Vacuum tube
A vessel of insulating material (usually glass) that is sealed and has a vacuum sufficiently high to permit the free flow of electrons between the electrodes that extend into the tube from the outside. In England, it is called a vacuum valve.
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Rhagiocrine vacuole
A vacuole present in the cytoplasm of a secretory cell that is filled with colloid material.
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Plasmocrine vacuole
A vacuole present in the cytoplasm of a secretory cell that is filled with crystalloid material.
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Heterophagous vacuole
A vacuole that contains substances that come from outside the cell.
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Contractile vacuole
A cavity filled with fluid in the cytoplasm of a protozoan. The cavity is emptied by sudden contraction of its walls.
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Autophagic vacuole
A vacuole that contains recognizable fragments of the ribosomes or mitochondria.
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Vacuolation
Formation of vacuoles.
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Vacuolated
Possessing or containing vacuoles.