Question
Identify the marked line in the image
| A. |
M line
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| B. |
Z line
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| C. |
A Band
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| D. |
I Band
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Show Answer
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Correct Answer � B
Explanation
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Answer-B: Z line
The parts of the cross-striations are frequently identified by letters. The light I band is divided by the dark Z line, and the dark A band has the lighter H band in its center. A transverse M line is seen in the middle of the H band, and this line plus the narrow light areas on either side of it are sometimes called the pseudo-H zone. The area between two adjacent Z lines is called a sarcomere.
So basically the sarcomere consist of two lines:
Z-line – forms periphery of sarcomere where thin actin filaments attach
M-line – found inside H-zone and forms the middle of the sarcomere
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