In acute laryngitis, which is the most common cause of voice loss and hoarseness, you suddenly lose your voice or become hoarse. 1  Acute laryngitis can result from: 2  Viral infection. Viral infections, such as those that cause the common cold, can cause your vocal cords to swell. 3  Bacterial throat infection.
The definition of a hood is slang for a neighborhood. An example of a hood is what youâd call the area in which you live in the inner city. Hood is defined as the front top of a car or other vehicle that covers and protects the engine, or a protective covering that removes fumes or exhaust.
A fume hood carries away vapors from reagents or reactions you may be working with. Using a fume hood correctly will reduce your personal exposure to potentially harmful fumes or vapors. When using a fume hood, keep the following in mind.  Place equipment or reactions as far back in the hood as is practical.