Which cell type is long and slender and contains fibers that aid in contracting and relaxing muscles?

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Multiple Choice

Which cell type is long and slender and contains fibers that aid in contracting and relaxing muscles?

Explanation:
Muscle cells are long, slender cells that contain organized contractile fibers. These fibers, mainly actin and myosin arranged in repeating units called sarcomeres, slide past each other to shorten the cell during contraction and then lengthen as it relaxes. This specialized setup lets muscles generate force and movement. Nerve cells transmit signals, epithelial cells form coverings and linings, and adipocytes store fat, none of which are built for contraction in the same way. So the long, fiber-containing muscle cell best fits the description.

Muscle cells are long, slender cells that contain organized contractile fibers. These fibers, mainly actin and myosin arranged in repeating units called sarcomeres, slide past each other to shorten the cell during contraction and then lengthen as it relaxes. This specialized setup lets muscles generate force and movement. Nerve cells transmit signals, epithelial cells form coverings and linings, and adipocytes store fat, none of which are built for contraction in the same way. So the long, fiber-containing muscle cell best fits the description.

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