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When taking an apical pulse, the diaphragm of the stethoscope is placed:

A) between the third and fourth ribs. B) in the fifth intercostal space at the midaxillary line. C) in the fifth intercostal space directly over the apex of the heart. D) in the fourth intercostal space even with the clavicle.

Low-frequency sounds are processed

A) at the helicotrema. B) at the apex. C) at the base. D) at the round window.