Cells of which one of the following tissues in animals undergo contraction and relaxation?
Muscular tissue
Connective tissue
Epithelial tissue
Nervous tissue
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UPSC Geoscientist – 2020
Muscular tissue is the tissue in animals that undergoes contraction and relaxation.
Muscle cells ( myocytes or muscle fibers) contain specialized proteins, primarily actin and myosin, that interact to cause the cell to shorten (contract) and then return to its original length (relax). This ability is fundamental to movement in animals.