C. Human skeleton is composed of 206 bones. Joints represent a compromise between strength and mobility. C. Human skeleton is composed of 206 bones. Joints represent a compromise between strength and mobility. C. Human skeleton is composed of 206 bones.
Joints represent a compromise between strength and mobility.
Each muscle fiber is an elongated, multicellular muscle cell. Each muscle cell is composed of hundreds of myofibrils that run length of fiber. Each myofibril contains assemblies of thin filaments of actin and thick filaments of myosin. Each repeating unit of thick and thin filaments comprises a sarcomere, the functional unit of muscle. C. Muscle contraction 1.