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Muscle Tissue Ch. 10

Test Review

functions of muscular system movement, posture, & heat production
point of attachment that doesnt move origin
three types of muscle tissue skeletal, cardiac, and smooth
point of attachment that does move w/ contraction insertion
prime mover agonist
relaxes during contraction antagonist
muscle cells are called muscle fibers
name the layers of tissue in order epimysium, perimysium, & endomysium
muscular tissue order muscle>fascicles>muscle fiber>myofibril>filaments
excitability (irritability), contractility, & extensibility, had T tubules that extend across the sarcoplasm, muscle cells called fibers, muscle fibers contain lots of mitochondria & nuclei Skeletal muscle
composed of tapered cells w/ single nuclei, thick and thin myofilaments arranged differently (not organized into sarcomeres), no T tubules, & two types-Visceral muscle & Multiunit Smooth muscle
only in heart, contains parallel myofibrils, T tubules are larger and form diads w/ sarcoplamic reticulum, does not run low on ATP, does not experience fatigue, & is self-stimulating Cardiac muscle
segment of myofibril between two Z lines; each myofibril consists of many sarcomeres, contractile unit of muscle fibers Sarcomere
seperate muscle into small sections perimysium
bundles of skeletal muscle fibers fasicles
covers individual muscle fibers endomysium
mitchondria-cytoplasma sacroplasma
produce and stores calcium ions sacroplastmic reticulum
passes across the muscle transverse t-tubule
light and dark striations myofilaments
thin filament actin
thick filament myosin
functional unit of skeletal muscles sarcomere
small bundle or cluster of skeletal muscle fibers bound together by perimysium Fasicicle
fascicles muscle cover
muscle fibers cell, round cylinder
contraction mechanism myofilaments
collections of sarcomeres muscle fibers
double strands actin
single strands myosin
CT covering skeletal muscle fibers Endomysium
CT surrounding fascicles Perimysium
plasma membrane of a striated muscle fiber Sarcolemma
functional unit composed of a single motor neuron w/ muscle cells it innervates Motor unit
muscle fiber Myofiber
threadlike structures found in myofibrils composed of myosin (thick) & actin (thin) Myofilament
mechanism of muscle contraction and relaxation sliding filament model
functional unit of muscle tissue sarcomere
protein that forms tow fibrous strands twisted around each other to form bulk of thin filament Actin
thin band I band
thick band H band
overlaping thick and thin band A band
terminal point Z line or disc
what band remains the same? A band
a point where neuron and muscle comes together? neuromuscular junction
protein that holds tropomyosin molecules in place Troponin
Categories of muscles Parallel, Convergent, Pennate, & Bipennate
what releases from the synaptic knob or end bulbs? acetylcholine
to Kick a soccer ball, you use quadriceps & gracillas
to Smile, you use orbicularis oris, zygomaticus major, & buccinator
Perform sit-ups, you use abdominal oblique
occurs a few hours after death Rigamortis
this is necessary for muscle contraction and relaxation ATP
to Shrug shoulders, you use trapezius & deltoid
capable of developing greater forces, contracting faster and have greater anaerobic capacity Fast-twitch fibers
develop force slowly, can maintain contractions longer and have higher aerobic capacity slow-twitch fibers
neurotransmitter released at neuromuscular junction Acetylcholine