Locomotion And Movement

Synovial joints show a considerable movement. There is a synovial membrane composed of? secretory epithelial cells which secrete thick, sticky synovial fluid. It lubricates joint, provides nutrients and helps to maintain the stability of joint. Gliding joint, hinge joint, pivot joint, ball and socket joint, saddle joint, condyloid joint, all "are types of synovial joints. Su hires forming the cranium are examples? of? fibrous or immovable joints.

Flight muscles of eagles are red or slow muscle fibres, which are rich in mitochondria and contain myoglobin. Myoglobin stores some oxygen for use during contraction of muscles .. The flight muscles of eagles depend mainly on aerobic metabolism. This enables them to perform slow and sustained contraction for prolonged periods without fatigue.

Intercalated discs are specialized regions of cell membrane of two adjacent cardiac muscle fibres. The intercalated discs function as boosters of contraction wave and permit the wave of muscle contraction to be transmitted from one cardiac fibre to another.