Answer :
Answer:
True
Explanation:
That's almost correct! The dark band formed by parallel thick filaments that partly overlap the thin filaments is actually called the A band in striated muscle fibers.
Here's a breakdown of the sarcomere structure in muscle fibers:
A band: This is the dark band that contains thick filaments (composed of myosin) and overlaps with thin filaments (composed of actin).
H zone: This is a lighter region within the A band where there are only thick filaments (no thin filaments overlap).
I band: This is the light band that contains thin filaments (actin) and does not overlap with thick filaments.
Z line: This is a structure that bisects the I band and anchors thin filaments (actin).
So, the correct term for the dark band you described is the A band, not the H band. The H band specifically refers to the region within the A band where there are no overlapping thin filaments.
