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39 Cards in this Set
- Front
- Back
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Muscular atrophy is a wasting away of muscles when does atropy start?
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When you cast a bone after about 7 days
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What are sarcomeres?
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they are the basic functional units of a myofibril which is a basic functioning unit of a muscle
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What is a Z disc?
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is the ends of the sarcomeres and they all get short at the same time
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Where does the Zdisc pass through?
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The center of the I band
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Where is the M line?
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the middle
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Name germ layer that gives rise to muscle tissue.
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stem cells
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What is the neuromuscular junction (NMJ)?
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the synapse between a somatic motor neuron and a skeletal muscle fiber
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a synapse is a region of communication betwen two neurons or a ?
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Neuron and a target cell
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What is the neurotransmitter at a NMJ?
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(ACH) acetylcholine
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What is the role of an agonist?
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(prime mover) triceps
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What is the role of an antagonist?
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biceps
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What is the role of a synergist?
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keeps it even (balance)
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How are skeletal muscles named?
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based on several types of characteristics: direction in which the muscle fibers run, the size, shape, action, numbers of origins, and location of muscle, and the sites of origin and insertion of the muscle
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What is Myology?
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study of muscles
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What is an intercalated disk?
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the end of fibers in cardiac muscle
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What is a Z disc?
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The ends of sarcomeres.
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What are sarcomeres?
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basic functioning unit of myofibril
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What is sarcoplasmic reticulum?
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wrap around each myofibrils
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What is Fascia?
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Fascia is fibrous membrane covering, supporting, and separating muscles
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What is the motor unit?
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The motor unit is the motor neuron and muscle fiber it stimulates
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What is Peristalsis
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successive muscular contraction along a hollow muscular structure (swallowing)
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What is complete muscle fiber?
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myofiber
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What is threadlike structures running longitudinally through muscle fiber?
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myofibril
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What is contractile protein?
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actin and myocin
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What is actin and myocin?
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myofilament
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The thin band is called?
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actin
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The thick band is called?
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myosin
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What is separate individual muscle fiber?
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endomysium
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What is divided muscle into bundles?
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perimysium
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What is epimysium?
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fibrous connective tissue around muscle
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What attaches muscle to bone
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tendons
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What attaches bone to bone
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ligaments
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What is aponeurosis
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sheet like tendon attaching muscle to muscle
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How does a muscle contract?
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the thick filament pulls the thin filament to the M line thats how a muscle contracts
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origin means
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beginnning
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insertion means
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end
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belly means
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thick middle
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agonist means
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prime mover = leader (tricep)
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antagonist means
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resistant= anti against example: bicep
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