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51 Cards in this Set
- Front
- Back
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What is a myofiber?
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An entire muscle cell
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What do myofibers in skeletal muscle look like?
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Large eosinophilic polygonal structures with basophilic nuclei.
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Where are the nuclei of skeletal muscle fibers located?
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Peripherally
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What connective tissue surounds individual myofibers?
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Endomysium
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What is the light pink wispy material that may be within endomysium?
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Collagen
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What structures may be within endomysium?
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Capillaries
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What type of epithelium lines capillaries?
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Simple squamous
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What type of epithelium lines the lumen of this pharynx?
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Stratified squamous
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What are the groups of myofibers that occur in muscle called?
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Fascicles
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What surrounds fascicles?
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Perimysium
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What structures can be found in perimysium?
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Arterioles
Venules Nerves |
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what surrounds an entire muscle?
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Epimysium
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What is epimysium?
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Fascia
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What is another name for the nuclei that are located peripherally in skeletal muscle?
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Myonuclei
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How many nuclei are associated with each skeletal muscle myofiber?
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Many
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Do skeletal muscle myofibers normally branch?
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No
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What shape are myofibers?
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Cylindrical
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What is the ultrastructure of a myofiber?
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ZIAH
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What is the Z line?
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Where actin is attached
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What is the I band?
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Only light chains
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What is the A band?
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Overlapping Light and Heavy
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What is the H band?
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Only Heavy
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What does a thick filament consist of?
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Myosin
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3 components in Thin filaments:
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-Actin
-Troponin -Tropomyosin |
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What is a contractile unit of striated muscle from one z line to the next called?
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Sarcomere
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What band decreases in width during a contraction?
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I band
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What is released at the NMJ of a skeletal muscle?
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ACh
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What are the cells that generate myoblasts?
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Satellite cells
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Where are satellite cells located in muscle?
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Between the basal lamina and plasma membrane of the myocyte.
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What is a Neuromuscular Spindle?
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A stretch receptor
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What special muscle structures are within neuromuscular spindles?
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Intrafusal fibers
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What is unique about intrafusal fibers?
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They are surrounded by a capsule
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Where within a whole muscle are intrafusal fibers found?
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In the perimysium
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What do neuromuscular spindles do for muscle?
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regulate its tone
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What are the 3 levels of esophagus?
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Upper 1/3 - skeletal
Middle 1/3 - mixed Lower 1/3 - smooth |
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What is the diameter of smooth muscle fibers like in a cross section?
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Variable
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Where are the nuclei in smooth muscle fibers?
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Central
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What shape are smooth muscle cells?
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Spindle shaped
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How many nuclei are associated with each smooth muscle myofiber?
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1
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What type of muscle is in the ductus deferens?
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Smooth
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What type of muscle is in the cremaster muscle?
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Skeletal
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What do nuclei look like in the ductus?
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Elongated - cigar shaped
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What type of muscle lines blood vessels?
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Smooth
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What is cardiac muscle more similar to in longitudinal views?
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Skeletal - it's striated
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How many nuclei are associated with each cardiac myocyte?
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1-2
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Do cardiac muscle myofibers normally branch?
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Yes
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Where are cardiac myofiber nuclei located?
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Centrally
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What structure joins myofibers?
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Intercalated disks
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What 2 structures make up intercalated disks? In what part?
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Gap junctions (LATERAL)
Fascia Adherens (transverse) |
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What is the function of intercalated disks?
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Cell adhesion
Electrical coupling |
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Why is a cross section of cardiac myofibers so variable?
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Because they branch.
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