PHYSIOLOGY
SKELETAL MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A band
|
|
|
Z lines
|
|
|
H zones
|
|
|
sarcomere
|
Detailed explanation-1: -A sarcomere is the basic contractile unit of a myocyte (muscle fibre). A sarcomere is composed of two main protein filaments (thin actin and thick myosin filaments) which are the active structures responsible for muscular contraction.
Detailed explanation-2: -The A band in skeletal muscle is also called as anisotropic band. The anisotropic band is made of both actin filaments and myosin filaments.
Detailed explanation-3: -A-band contains both actin and myosin. M-line and Z-line are in the middle of thick and thin filaments, respectively.
Detailed explanation-4: -A-band: The length of a myosin within a sarcomere. M-line: The line at the center of a sarcomere to which myosin bind. Z-line: Neighboring, parallel lines that define a sarcomere. H-band: the area adjacent to the M-line, where myosin is not superimposed by actin.