Clonus is characterized by which one of the following?
A. Involuntary, repetitive, and rhythmic muscle contractions in response to muscle stretch
B. Decrease in resistance to passive stretch of a hypertonic muscle
C. Excessive resistance to both passive and active muscle stretch
D. Prolonged contraction of antigravity muscles
E. Brief, involuntary contraction of a single muscle fiber
ANS: A
Rationale: The definition of clonus is involuntary, repetitive, and rhythmic muscle contractions in response to muscle stretch.
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