Cells of which one of the following tissues in animals undergo contrac

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

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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.

There are three types of muscular tissue: skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle is responsible for voluntary movements, smooth muscle for involuntary movements in internal organs (like digestion and blood flow), and cardiac muscle is responsible for the pumping action of the heart. Connective tissue provides support, binds tissues together, and transports substances. Epithelial tissue covers body surfaces and lines cavities. Nervous tissue transmits electrical and chemical signals.

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