How do the H bands and I bands of the sarcomere differ?
In respect to this, how is the H zone different from the a band?
structure of myofilament …is a region called the H zone; the H zone looks somewhat lighter than the overlap region of the A band. Also in the A band is a narrow, lightly stained region that contains bare thick filaments without cross bridges and is called the pseudo-H zone.
One may also ask, what are A bands and I bands? In between the A bands is a light area where there are no thick myofilaments, only thin actin filaments. These are called the I Bands. The dark bands are the striations seen with the light microscope. When a muscle contracts the light I bands disappear and the dark A bands move closer together.
Similarly, you may ask, what is the H band in a sarcomere?
H-band is the zone of the thick filaments that has no actin. Within the H-zone is a thin M-line (from the German "Mittelscheibe", the disc in the middle of the sarcomere) formed of cross-connecting elements of the cytoskeleton.
What is the H band of a sarcomere quizlet?
Visible, alternating light (I) & dark (A) bands which run at right angles to the length of a muscle fiber (cell). H band is visible within the A band. The light and dark colors are due to the overlapping arrangement of thick, thin, and elastic filaments in a sarcomere.