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Smooth Muscle

Smooth muscle is involuntary. There are no striations and contraction is slow, but the muscles can remain contracted for a long time. Each spindle-shaped fibre has only one nucleus and there is no regular arrangement so cells can contract in different directions.

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Specification: OCR Biology A (H420), A-level, 5.1.5 Plant and animal responses. Topic: Muscles.

More in Muscles

All 15 lessons in Muscles · All OCR A-level Biology topics