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The skeletal muscles are under voluntary (conscious) control most of the time. However, skeletal muscle movement can also by induced by involuntary reflexes.
Reflexes are involuntary reactions to a stimulus such as the burning of the hand. As soon as a hot substance contacts the hand, pain receptors in the skin send a signal to the spinal cord. In turn, the spinal cord sends a signal back to the arm muscles that instruct the hand to pull away. The arm flexed as it withdrew, which is known as a flexor (withdrawal) reflex.
If the body did not have the reflexes to withdraw quickly from a painful stimulus, we would be at risk for serious injury.
Reviewed ByReview Date: 10/05/2008
Luc Jasmin, MD, PhD, Gene Therapeutics Research Institute, Cedars-Sinai Medical Center, Los Angeles CA. Review provided by VeriMed Healthcare Network.
Katheryn Barrows
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