NEET BIOLOGY

Detailed explanation-1: -I bands are composed of thin actin filaments and proteins that bind actin and they are bisected by the Z line.

Detailed explanation-2: -A-band consists of myosin and I-band consists of actin.

Detailed explanation-3: -Inside a sarcomere there are several regions. One such region is the I band, which consists of the actin filaments in the region where they are not superimposed by the myosin filaments. This means that the I band consists only of actin filaments; however, actin filaments aren’t exclusive to the I band.

Detailed explanation-4: -Thick bands are made of multiple molecules of a protein called myosin. The thin bands are made of multiple molecules of a protein called actin.

Detailed explanation-5: -actin, protein that is an important contributor to the contractile property of muscle and other cells. It exists in two forms: G-actin (monomeric globular actin) and F-actin (polymeric fibrous actin), the form involved in muscle contraction.