What is the primary protein composition of the 'dense bodies' found in the sarcoplasm and on the sarcolemma?
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Correct answer: Alpha-actinin
Dense bodies contain alpha-actinin, which cross-links the actin filaments. This provides a structural framework similar to the Z-line found in skeletal and cardiac muscle tissues.
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More Smooth Muscle Histology questions
- Smooth muscle lacks T-tubules. Which invaginations of the sarcolemma are thought to function similarly by sequestering calcium ions?
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- Which enzyme is responsible for phosphorylating the myosin head to allow it to bind to actin in smooth muscle?
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