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9 Cards in this Set

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Function&Control of Skeletal Muscle
Voluntary Movement; controlled by the Somatic nervous system
Skeletal Muscle:
Makeup of Muscle
Long parallel fibers--> muscle fibers.
Skeletal Muscle:
Muscle Fibers?
Multinucleated cell created by the fusuion of many mononucleate enbryionic cells. Nuclei are usally on the periphery of the cell. Embedded w/in the fibers are _MYOFIBRIL_ filaments.
cytoplasm of muscle fibers: sarcoplasm.
Cell membrane: sarcolemma
Skeletal Muscle:
Unit of Myofibrils
sarcomeres... divided by transverse tubules
Skeletal Muscle:
Covering of Myofibrils
Sarcoplasmic Reticulum (a type of modified endoplasmic reticulum that stores Ca2+ ions)
Skeletal Muscle:
Cell membrane of Muscle Fiber:
Name and Function
Sarcolemma, can propagate an action potential
Skeletal Muscle:
T system
transverse tubules that are oriented perpendicularly to myofibrils. T sys provides channels for ion flow throughout muscle fibers & can also prop an axn potential
Skeletal Muscle:
Looks like?
striated.. has light and dark bands. Also typified as red or white.
Skeletal Muscle:
Red vs white
Red Fibers: slow-twitsh, high myoglobin content (protein that resembles hemoglobin) and many mitochondria--> long dist runners, aerobic activity
White fibers: fast-twitch, abaerobic--> less myoglobin and fewer mitochondria, greater rate of contraction but more fatiguable.