Question:
Talk about the bands forming the sarcomere.
Author: H KAnswer:
The dark band A is formed of thick myosin filaments and thin actin filaments arranged in a parallel manner, while the I band is formed of only thin actin filament. Band A comprises in its middle a clearer transverse zone called M zone (dark transverse line). Myosin molecule comprises a cylindrical rod or axis (tail) which terminates at one of its ends by 2 spherical heads that interact with actin through actin binding sites, and have ATPase activity necessary for hydrolysis of ATP.
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H K![H K](https://lh4.googleusercontent.com/-V3rEIOcuFis/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnhTzvoiq2vqvBJhe7t9kqRkO_jNw/s96-c/photo.jpg)