MICROANATOMY

Detailed explanation-1: -Sarcomeres consist of highly ordered arrays of thick myosin and thin actin filaments along with accessory proteins.

Detailed explanation-2: -Thick myofilaments are comprised of around 300 spirally arranged protein molecules called myosin. Each myosin molecule is composed of two heavy chains and four light chains.

Detailed explanation-3: -An individual sarcomere contains many parallel actin (thin) and myosin (thick) filaments.

Detailed explanation-4: -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-5: -Thick and thin filaments, which comprise the myofilaments, are composed primarily of the proteins myosin and actin, respectively, and the light band of the sarcomere is the portion where only thin filaments are present and the dark band is where both thick and thin filaments are present.