Final answer:
The normal breath sound heard over most of the lung surface is vesicular, which is distinct from bronchial, bronchovesicular, and the abnormal adventitious sounds.
Step-by-step explanation:
The type of breath sound that is normally heard over the entire surface of the lungs except for the upper intrascapular area and the area beneath the manubrium is vesicular. Vesicular sounds are soft and low pitched and associated with air passing through the smaller bronchioles and alveoli. They are different from bronchial sounds that are normally heard over the trachea and have a higher pitch, and bronchovesicular sounds that are typically heard over the main bronchus area and between the scapulae, and are intermediate between vesicular and bronchial sounds. Adventitious sounds are additional sounds like wheezing or crackling that are not normally heard in healthy lungs but may indicate a pathological process.