Singstar songs associated another system

Skeletons may be internal like the human skeletons, or they may be external like the exoskeleton of crabs. In organisms with limbs, tendons and other connective tissues are used to secure muscles to the joints and skeleton. This action propels them through the water. The most basic movements of fish include contracting muscles on opposite sides of the body in succession.

Organisms have adopted a variety of methods to use the contractile function of the muscular system to move through the environment. The most obvious function of the muscular system is movement. Nerve signals originating in the brain travel to specific muscles, allowing organisms to stimulate specific muscle tissues to produce coordinated actions like running, swimming, and flying. To achieve this coordination, muscles are innervated by the nervous system. The muscular system relies on the coordinated action of millions of actin and myosin filaments pulling in the same direction at the same time. In some organisms, completely different proteins are used. Depending on the muscle cell, different forms of actin and myosin can be used. This moves the protein filaments and contracts the fiber. The head releases the actin, reaches forward, and grips the actin again. As seen in the graphic below, the muscular system contracts when energy from ATP is applied to the myosin heads of the myosin protein filament.

Singstar songs associated another system