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Muscle Tissue is generated by interaction of

contractile role in addition to being able to secrete collagen

what are the 3 single cell contractile units

cytoplasm of muscle cells

3 Multicellular contractile units

component of a certain secretory glands

smooth muscle like cells

surrounding cell membrane or plasmalemma

fusiform, lack striation, slow and involuntary contractions

long, multinucleated, with cross striations, quick, forceful, voluntary

smooth endoplasmic reticulum

surrounds all 3 types of muscles; contractile forces from internal contractile proteins to external lamina via link protein.

intercalated discs, involuntary, vigorous, and rhythmic

elongated muscle cells

process of sliding interaction of myosin filaments along actin filaments

Functions of Muscular Tissue

consists of elongated muscle cells called muscle fibers or myocytes

Usually attached to bones by tendons

long cylindrical fiber

Structures of Skeletal Muscle Fiber

long finger like invaginations of the sarcolemma that penetrate into thesarcoplasm

found just beneath the sarcolemma

how many nuclei are found in each skeletal muscle fiber

red colored protein found only in muscle; binds oxygen molecules that diffuse into muscle fibers

large molecule composed of many glucose molecules; can be used for ATP Synthesis

lie in rows throughout the muscle fiber

contractile organelles of skeletal muscle; arranged in parallel bundles

fluid filled system of membranous sacs that encircles each myofibril

basic functional contractile unit of myofibril

narrow region in center of each A band

narrow, plate shaped regions of dense materials

region in center of H zone that contains proteins that hold filaments together at center of sarcomere

consists of long series of sarcomeres

dark, middle part of sarcomere

lighter, less dense area of sarcomere

3 layers of Skeletal Muscle

surrounds and separates individual muscle fibers from one another; consists mostly of reticular fibers

outer layer, encircling the entire muscle; consists of dense irregular connective tissue

surrounds groups of 10 to 100 or more muscle fibers, separating the bundles called fasicles; consists of dense irregular collagenous connective tissue

3 kinds of muscle proteins

help switch the contraction process on and off

generate force during contraction

main component of thin filament; functions as a motor protein

component of thin filament

makes up thick filament; a molecule consists of a tail and two heads

keep thick and thin filaments of myofibrils in proper alignment

connects Z disc to M line of sarcomere

regulatory protein that is a component of thin filament

forms M line of sarcomere; binds to titin molecules and connects adjacent filaments to one another

links thin filaments of sarcomere to integral membrane proteins

wraps around entire length of each thin filament; helps anchor thin filaments and regulates length of thin filaments during development

structural proteins of Z discs that attaches to actin molecules of thin filament

3 types of skeletal muscle fibers

largest and contain large amounts of myoglobin

fibers appear dark red because they contain large amounts of myglobin

have low myoglobin content; contain large amounts of glycogen and generate ATP

located in the heart and large vessels attached to the heart

Branched cylindrical fiber with one centrally located nucleus

regulatory proteins

length of cardiac muscle tissue (long)

diameter of cardiac muscle tissue (large)

found in walls of hollow viscera, airways, blood vessels etc…

shape of fibers

develop from mesodermal cells

length of smooth muscle fiber (Intermediate)

Diameter of smooth muscular fiber (small)

it can occur in skeletal muscle because of a population of reserve muscle satellite cells

rapid in smooth muscle because the cells/fibers are small and relatively less differentiated

Cardiac muscle lacks?

filled with interstitial fluid