All are designed to produce maximum possible power 2. Cross-striations are observed in skeletal, cardiac and smooth muscle.
Cross striations are due to the sarasmeric structure of muscle.
The crossbridge is formed by interaction of them myosin head with active sites as actin. Myosin tails serve to anchor the myosin filament in the I band. Myosin ATPase activity is quite slow in the absence of actin. Once activated, all myosin heads hydrolyze ATP at the same rate. An actin binding site and an ATP binding site are present on opposite sides of the myosin head.