They occur when air moves through fluid-filled airways. Rales are further described as moist, dry, whistling, fine, coarse, or other descriptions. Rhonchi are sounds with a loud, low, coarser sound. They may be further described as musical, groaning, snoring , and so on. They are produced when the larger airways are filled with fluid.
Wheezes are high-pitched, musical sounds produced by narrowed airways, occurring during expiration.
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