Which of the following types of abnormal contractions of skeletal muscle is caused by a single muscle fiber,is spontaneous,and is not visible under the skin?

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Fibrillation is an abnormal contraction of skeletal muscle caused by a single muscle fiber that is spontaneous and not visible under the skin. It is often indicative of underlying nerve or muscle disease. Tic and tremor are visible under the skin and involve multiple muscle fibers, while fasciculation and cramp involve multiple muscle fibers but may not be caused by a single fiber.

Which of the Following Types of Abnormal Contractions of Skeletal