The stethoscope's diaphragm is larger than the bell. So remember - diapragm (LARGER) picks up HIGH pitched sounds; Bell (SMALLER) picks up LOW pitched sounds.
AeGophony- like bleating of A Goat ; Ask the patient to say 'A', you hear 'E' (AEgophony)
Bronchophony - spoken from the EARpiece (BEAR).
sIbiliant rhonchi is hIgh pitched; sOnorous- lOw pitched
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