Final answer:
Loud, wet, crackling lung sounds are known as crepitations and are most commonly associated with conditions like pneumonia. They usually occur during the end of inspiration and the beginning of expiration, distinctly separate from the typical "lub-dub" heart sounds caused by heart valves closing.
Step-by-step explanation:
The type of lung sounds that are described as "loud, wet, crackling" are often referred to clinically as crepitations or rales. These sounds are indicative of fluid within the lung tissues and alveoli and may suggest conditions such as pneumonia, pulmonary edema, or fibrosis. Crepitations are usually heard during the end of inspiration and the beginning of expiration, and are unrelated to the heartbeat, which has its own distinct sounds, commonly known as heart sounds.
Normal heart sounds, on the other hand, are described as "lub-dub", corresponding to the closing of the heart valves. The first heart sound (S₁) occurs when the atrioventricular valves close, and the second heart sound (S₂) occurs when the semilunar valves close. These are different and separate from the lung sounds described as crepitations.