Question

What do you mean by the term dark and light band of the muscle?

Answer 1

hello!

The term dark band and denotes the region of muscle having high concentration of myosin protein and is opaque in nature. It is also called anisotropic region.
The term light band denotes the region of muscle composed of actin protein and is transparent in nature. This regiin is also called the isotropic region.

hope it helps... :)

Answer 2

The term dark band and denotes the region of muscle having high concentration of myosin protein and is opaque in nature. It is also called anisotropic region. 
The term light band denotes the region of muscle composed of actin protein and is transparent in nature. This regiin is also called the isotropic region.