Muscle tissue, tendons, blood vessels, and nerves are all apart of this system. Skeletal muscles work in groups to produce movement. This system is the only kind that can produce movement and does so with contracting. Visceral, and cardiac muscles are responsible for shipping blood and food throughout the body. Contracting muscles cause a high metabolic rate which go on to produce body heat.
Acetylcholine: a compound that occurs throughout the nervous system, in which it functions as a neurotransmitter.
Actin: basis of muscle contraction.
cardiac muscle: an involuntary, striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium.
insertion: the manner or place of attachment of an organ.
motor unit: made up of a motor neuron and the skeletal muscle fibers innervated by that motorneuron's axonal terminals. Groups of motor units often work together to coordinate the contractions of a single muscle
muscle fiber: A cylindrical multinucleate cell composed of myofibrils that contract when stimulated.
myofibril: any of the elongated contractile threads found in striated muscle cells.
Myosin: large superfamily of motor proteins that move along actin filaments
origin: attachment site that doesn't move during contraction
sarcomere: a structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer half of each adjacent pale band.
skeletal muscle: a form of striated muscle tissue which is under the 'voluntary' control of the somatic nervous system.
sliding filament theory: the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement.
smooth muscle: muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control.
Striated: muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes
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