Pitch refers to the ________ of sound waves; pitch is determined by the tension produced by ________ laryngeal muscles.

A. loudness; intrinsic
B. frequency; extrinsic
C. loudness; extrinsic
D. frequency; intrinsic


Answer: D

Anatomy & Physiology

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Indicate whether the statement is true or false

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Which of the following structures sets the pace of heart contraction?

atrioventricular bundle SA node bundle branches AV node

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