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what are the major functions of the muscular system
- producing movement
- maintaining posture
- stabilizing joints
- generating heat
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what is the gross structure of skeletal muscle
- muscle fivers
- blood vessels
- nerve fivers
- connective tissue (which supports each cell & reinforces the muscle as a whole)
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differentiate between endomysium, perimysium, epimysium, and fascicle
- epimysium: surrounds whole muscle
- perimysium: surrounds a fascicle
- fascicle: bundles of muscle fibers
- endomysium: area between the individual muscle fivers in a fascicle
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what is the sarcolemma
plasma membrane of a muscle fiber
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what is the sarcoplasm
the cytoplasm of a muscle cell, is similar to the cytoplasm aof other cells but it contains unusually large amounts of glycosomes and myoglobin
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what is glycosomes
granules of glycogen that provide glucose during muscle cell activity
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what is myoglobin
a red pigment that stores oxygen (O2 binging protein)
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what is a myofibril made of.
- thick filaments
- thin filaments
- elastic filaments
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what makes up a sacromere
- z disc: anchors thin filaments boundary
- i band: thin filaments only & Z disc in the middle
- A band: full length of thick filaments an overlapping thin filaments
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what is the protein composed in a thick filaments
myosin
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know what actin, tropomyosin, and troponin
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what is myasthenia gravis
an autoimmune disease here antibodies block ACH receptors.
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what is botulism
poisoning from a toxin produced by a bacterium from contaminated foods which cut off snare proteins that stop the release of ACh
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