The diaphragm of the stethoscope is better than the bell for auscultation of the lungs because it:
a. amplifies all types of sounds.
b. filters extraneous sounds.
c. pinpoints focal sound areas.
d. transmits high-pitched sounds.
D
The diaphragm is the better source because it transmits the normally high-pitched sounds of the lung, and it has a broader area from which to listen. Unless specially modified, the stethoscope does not amplify sound, filter extraneous sounds, or pinpoint focal sound areas.
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