ANATOMY

Detailed explanation-1: -Based on the dimensions, the above-mentioned structures can be arranged in the following way from the largest to the smallest component: Muscle fiber → Myofibril → Sarcomere → Thin-filaments →Troponin.

Detailed explanation-2: -The sarcomere is the smallest functional unit of a skeletal muscle fiber and is a highly organized arrangement of contractile, regulatory, and structural proteins.

Detailed explanation-3: -Of all the answers, the largest structure is the fascicle. Fascicles are made up of muscle fibers and muscle fibers are made up of myofibrils. Myofibrils are made up of myofilaments which would make them the smallest structure in the list.

Detailed explanation-4: -Molecular level-actin and myosin. Microscopic level-sarcomere and myofibrils. Cell level-myoblasts and myofibers. Tissue level-neuromuscular junctions and fascicles.