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diaphram contracts and flattens out, increasing the length of the thoracic cavity, intercostal muscles contract, elevating the ribs and increasing the diameter of the thoracic cavity.
diaphram and intercostal muscles relax; decrease in size of the thoracic cavity increases pressure, and air moves out of the lungs.
heard over the sternum, last longer during expiration than inspiration; loud, high pitched, tubular, hollow-like sounds.
heard over the anterior one-third of the chest near the sternum and around the scapula posteriorly; medium pitch and intensity with inspiration- expiration being equal in duration.
heard over the majority of the lungs; soft, low-pitched sounds, heard best during inspiration and may be audible during expiration.
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