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Digestive System

By

The Manual's Editorial Staff

Last full review/revision Mar 2010| Content last modified Apr 2010
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Topic Resources
The Digestive System
NOTE: This is the Consumer Version. DOCTORS: CLICK HERE FOR THE PROFESSONAL VERSION
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Test your knowledge
Muscle Cramps
A cramp is a sudden, involuntary, and usually painful contraction of a muscle or group of muscles. Which of the following is the most common cause of muscle cramps?
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