Muscular system

function of muscular system

composed of muscle cells and tissues that beings about movement of an organ or body part

cardiac muscle

found only in the heart, striated, one nucleus per fiber, involuntary control (autonomic)

smooth muscle

narrow, spindle shaped w/ a single centrally located nucleus, involuntary (autonomic), found in digestieve system, arteries and veins, bladder, and eyes

skeletal muscle

striated, multiple nuclei per fiber, voluntary, found in tongue, diaphragm, and upper esophagus

characteristics of muscle tissue

extensibility, elasticity, excitability, contractility

what three steps are in the slidng filament theory

cross bridge, power stroke, and bridge detachment

muscle structure from large to small

muscle, fascicle, muscle fiber (cell), myofibril, sarcomere

fasicle

bundle of muscle fibers

muscle fiber (cell)

contains many myofibrils

myofibrils

made of repeating sarcomeres

sarcomere

contractile unit containing actin (thin) and myosin (thick)