MICROANATOMY

Detailed explanation-1: -Skeletal muscle contractions pull on the bones of the skeleton and allow those bones (and the body structures they support) to move. All three muscle types contain actin and myosin filaments, which work together to produce muscle contractions.

Detailed explanation-2: -Structure and Function of Skeletal Muscle Each sarcomere is composed of two main protein filaments-actin and myosin-which are the active structures responsible for muscular contraction.

Detailed explanation-3: -The contractile elements of skeletal muscle cells (myofibrils) are thin cylindrical structures 1–2 µm in diameter. They are composed of overlapping, repeating assemblies of thick (mainly myosin) and thin (mainly actin) filaments.

Detailed explanation-4: -The striations of skeletal muscle are created by the organization of actin and myosin filaments resulting in the banding pattern of myofibrils. These actin and myosin filaments slide over each other to cause shortening of sarcomeres and the cells to produce force.

Detailed explanation-5: -CARDIAC MUSCLE IS SIMILAR TO OTHER MUSCLE TYPES. Cardiac muscle, like skeletal muscle, is a striated muscle and much of the mechanism of contraction of the two muscle types is similar. Both use the proteins actin and myosin arranged in a highly organized lattice as the basis of the force-generating apparatus.