MEDICAL PHYSIOLOGY

Detailed explanation-1: -These bands correspond to the presence or absence of myosin filaments. The I bands contain only thin (actin) filaments, whereas the A bands contain thick (myosin) filaments. The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only myosin.

Detailed explanation-2: -Definition: The A band is the region of a striated muscle sarcomere that contains myosin thick filaments. In fact, the A band is the entire length of the thick filament of the sarcomere. Its length is approximately 1 m.

Detailed explanation-3: -The striated appearance of muscle results from the alternation of thick-filament-containing (A-Band) and thin-filament-containing (I-band) regions. The center of each A-band consists of a specialized region (M-line). Unlike vertebrate muscle, nematode striated muscle cells do not fuse to form a multinucleate myotube.

Detailed explanation-4: -The A band is the area in the center of the sarcomere where thick and thin filaments overlap. This gave researchers an idea of myosin’s central location. Within the A band is the H zone, which is the area composed only of thick myosin.

Detailed explanation-5: -The A band in skeletal muscle is also called as anisotropic band. The anisotropic band is made of both actin filaments and myosin filaments.