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Characteristics of smooth muscle fibres: • cells range from 5 to 10 μm in diameter and 30 to 200 μm in length • spindle-shaped • single, centrally located nucleus • smooth muscle tissue occurring within almost every organ, forming sheets, bundles or sheaths around other tissues. Smooth muscle differs from both skeletal and cardiac muscle tissues in structure and function. Sarcomeres or myofibrils are not present - therefore not striated, i.e. smooth.

1. Cells range from 5 to 10 μm in diameter and 30 to 200 μm in length.
2. Spindle-shaped.
3. Single, centrally located nucleus.
4. Smooth muscle tissue occurring within almost every organ, forming sheets, bundles or sheaths around other tissues.

Correct answer: Spindle-shaped.

Solution

Smooth muscle cells are characteristically spindle-shaped, meaning they are tapered at both ends. The other choices describe size, nucleus position, or tissue distribution rather than the defining shape.

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