Which of the following statements is correct regarding muscle contraction?
- AThe length of the $H$-zone increases.
- BThe length of the $A$-band remains constant.
- CThe length of the $I$-band increases.
- DThe distance between two $Z$-lines increases.
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$(1)$ The portion between two successive $Z$-lines is the functional unit of contraction,which is called the sarcoplasmic reticulum / sarcomere.
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$(1)$ The portion between two successive $Z$-lines is the functional unit of contraction,which is called the sarcoplasmic reticulum / sarcomere.
$(2)$ The thick filaments in the $A$-band are held together in the middle of this band by a thin fibrous membrane. It is called the $Z$-line / $M$-line.
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