Which structure in smooth muscle is functionally analogous to the Z-discs of striated muscle?
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Correct answer: Dense bodies
Dense bodies serve as the attachment points for thin (actin) and intermediate (desmin/vimentin) filaments. They allow the force of contraction to be transmitted to the sarcolemma and the surrounding network.
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More Smooth Muscle Histology questions
- What is the primary protein composition of the 'dense bodies' found in the sarcoplasm and on the sarcolemma?
- Smooth muscle lacks T-tubules. Which invaginations of the sarcolemma are thought to function similarly by sequestering calcium ions?
- Which regulatory protein does calcium bind to in order to initiate smooth muscle contraction?
- Which enzyme is responsible for phosphorylating the myosin head to allow it to bind to actin in smooth muscle?
- How are smooth muscle cells typically organized in the walls of hollow organs like the intestine?
- Which of the following is true regarding the sarcoplasmic reticulum (SR) in smooth muscle compared to skeletal muscle?