PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Thin, light, and actin
|
|
|
Thick, light, and actin
|
|
|
Thick, dark, and myosin
|
|
|
Thin, light, and myosin
|
Detailed explanation-1: -The thick and thin filaments overlap contain myosin to form dark bands called A bands. Alone, thin filaments form light bands, called I bands, and are made from actin. The spacing between Z-lines decreases and the width of the H and I-bands decreases also during muscle contraction.
Detailed explanation-2: -I bands (or isotropic bands): it is called the light band that contains only the thin filament (actin).
Detailed explanation-3: -The light bands are called I bands and contain only thin filaments. The dark bands are called A bands and contain thick and thin filaments, with the thick filaments running the entire length of the A band.
Detailed explanation-4: -I-band is the zone of thin filaments that is not superimposed by thick filaments (myosin). Following the I-band is the A-band (for anisotropic). Named for their properties under a polarized light microscope. An A-band contains the entire length of a single thick filament.