Bilateral contraction of the erector spinae muscles which are the iiliocostalis, longissimus and spinalis leads to extension/hyper extension of the back.
Anerobic contraction of muscles.
1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.1. unilateral (sometimes bilateral) contraction of the mentalis and orbicularis oris muscles caused by a brisk scratch made on the palm of the ipsilateral hand. For the source and more detailed information concerning this subject, click on the related links section (Definitions) indicated below this answer box.
The general opposite of contraction is expansion, or possibly inflation. For muscles, the opposite of contraction is relaxation.
A hereditary disease of the muscles characterized by prolonged contraction of the muscles whenever voluntary motion is attempted, contraction and relaxation being slow and the muscles stiff.
An involuntary muscle contraction is called a spasm.
contraction
extension, contraction
Acetylcholine
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prolonged contraction of the muscles
Muscles are tissues composed of fibers, the contraction of which produces movement in the body.