In a relaxed muscle fibril,the H-zone,a light | vedclass

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(A) The muscle fiber consists of alternating dark and light bands. The dark band is known as the $A$-band (Anisotropic band),which contains both actin

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Anisotropic or $A$-band

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(A) The muscle fiber consists of alternating dark and light bands. The dark band is known as the $A$-band (Anisotropic band),which contains both actin and myosin filaments. In the center of the $A$-band,there is a relatively lighter region called the $H$-zone,which consists only of thick myosin filaments. Therefore,the $H$-zone is located in the center of the $A$-band.

In a relaxed muscle fibril,the $H$-zone,a lighter region of low density,can be seen in the centre of:

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