GENERAL HISTOLOGY

Detailed explanation-1: -Most of the cytoplasm consists of myofibrils, which are cylindrical bundles of two types of filaments: thick filaments of myosin (about 15 nm in diameter) and thin filaments of actin (about 7 nm in diameter).

Detailed explanation-2: -What Are Actin and Myosin? Actin and myosin are both proteins that are found in all types of muscle tissue. Myosin forms thick filaments (15 nm in diameter) and actin forms thinner filaments (7nm in diameter). Actin and myosin filaments work together to generate force.

Detailed explanation-3: -An important feature of myosin polymerization is that myosin-II molecules are oriented in opposite directions in each half of the sarcomere. This orientation results in polarized thick filaments that help in directing force toward the center of the sarcomere.

Detailed explanation-4: -Thin filaments (actin) and thick filaments (myosin) are present in almost every cell type. Thin filaments, also called microfilaments, are 5 to 8 nm in diameter.