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Chp 9

Skeletal Muscular System

3 types of muscle tissue Skeletal, Cardiac, and Smooth
Excitability Response to stimulus
Contractability Shorten & exert tension
Extensibility Can contract even when stretched
Elasticity Rebound to original length after contraction
Produces movement of skeleton Skeletal Muscle
Maintains posture and body position Skeletal Muscle
Supports soft tissue Skeletal Muscle
Guards orifices Skeletal Muscle
Maintains body temp. Skeletal Muscle
Epimysium Surrounds WHOLE muscle
Perimysium Connective tissue layer that surrounds COLLECTION of Muscle Fibers
Fasiculus Connective tissue layer that has little compartments with compartments in it
Endomysium Connective tissue layer that surrounds INDIVIDUAL muscle fibers
Tendons connect muscle to bone; interwoven into periosteum and matrix of bone- forming a strong bond
Collagen bundles of these converge to form tendonds Epimysium, perimysium, and endomysium
Aponeurosis Thickened, Flattened TENDON
Skeletal Muscle Fiber = Muscle Cell
Muscle Fiber/Cell Large, cylindrical, multinucleated, long, striated, voluntary
Sacrolemma Cell membrane
Transverse tubules (T-tubules) invaginations of sacrolemma which carry electrical impulses
Sacroplasm Cytoplasm of muscle cell.
Myofibrils In sacroplasm, made up of myofilament/protein, (actin=thin, myosin= thick) Responsible for Contraction & Shortening.
Sacroplasmic Reticulum Surrounds myofibrils in the sacroplasm of a muscle cell.
Sacromere Smallest unit of muscle fiber in the sacroplasmic reticulum.
Attatched to the sacrolemma at each end of the cell Myofibril (as long as the muscle cell)
A band Thick filaments
I band Thin filaments
Sliding Filament Theory *Requires Calcium and ATP* Explains how muscle fiber exerts tension. Active sites on actin filaments. Head of myosin filament. Crossbridge of head of myosin to active site of actin. Attachment, pivot, detach (Ca gone), return
Neuromuscular Joint Where each skeletal muscle fiber is stimulated by a nerve fiber. Chemical Communication
Created by: afogel