What is the dark line lying in the middle of | vedclass

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(A) In the structure of a sarcomere,the $A$-band contains both actin and myosin filaments. Within the $A$-band,there is a central region where only th

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$M$-line

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(A) In the structure of a sarcomere,the $A$-band contains both actin and myosin filaments. Within the $A$-band,there is a central region where only thick myosin filaments are present,known as the $H$-zone. The $H$-zone is bisected by a thin,dark fibrous membrane called the $M$-line. Therefore,the dark line lying in the middle of the $H$-zone is the $M$-line.

What is the dark line lying in the middle of the $H$-zone called?

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