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Muscles, Bones, and Movement

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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    Muscles Work in Pairs

    Muscles Work in Pairs

    by CK-12 //basic

    Describes how muscles can only contract and pull the skeleton in one direction. Another muscle must pull the skeleton back into its starting position.

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