Question

which statement describes the dark bands in the striations of skeletal muscle fibers? they are called i bands and include the overlap of actin and myosin. they are called a bands and include the area of overlap of actin and myosin. they are called i bands and include the area of actin and z disc interaction. they are called a bands and include the area of actin and z disc interaction. need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill. all rights reserved. privacy center terms of use

Explanation:

In skeletal - muscle fibers, the dark bands are called A bands. The A band contains the region where thick myosin filaments and thin actin filaments overlap. I bands are the light - colored bands. Z discs are part of the I band structure and are not related to the composition of A bands in terms of the overlap that defines A bands.

Answer:

They are called A bands and include the area of overlap of actin and myosin.