In multicellular animals, these components are the skeleton and muscles. This process requires both a firm structure to provide leverage as well as a mechanism for moving that structure. All Khan Academy content is available for free at Unlike plants (and plant cells), animals (and often individual animal cells) are capable of movement. The information below was adapted from Khan Academy: The cytoskeleton. Explain the process by which the nervous system and the sarcoplasmic reticulum regulate muscle contraction.
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