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Chamberlain bios 252 exam 1 Questions and Answers with
Verified Solutions
skeletal muscle - ANSWER - long, thin, cylindrical in shape
- multinucleated
- attached to bone & skin
- voluntary
- striated
cardiac muscle - ANSWER - short, fat, branched
- uninucleated
- in heart
- attached to intercalated discs
- involuntary
- striated
smooth muscle - ANSWER - in hollow organs
- ininucleated
- involuntary
- lack striations
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excitability - ANSWER responsiveness to chemical signals,
stretch, and electrical changes across the plasma membrane
conductivity - ANSWER local electrical excitation sets off a wave
of excitation that travels along the muscle fiber
contractility - ANSWER shortens when stim
extensibility - ANSWER capable of being stretched b/w
contractions
elasticity - ANSWER returns to its original rest length after being
stretched
organization of skeletal muscle - ANSWER microfilaments,
myofibril, muscle fiber, muscle fascicle, and skeletal muscle
endomysium - ANSWER thin sleeve of loose CT around each
fiber
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perimysium - ANSWER thicker layer of CT that wraps fascicles
fascicles - ANSWER bundles of muscle fibers wrapped together
epimysium - ANSWER fibrous sheath surrounding entire muscle
what are the components of the sarcomere - ANSWER z disc, m
line, a band, i band, zone of overlap, thick filament, thin
filament, zone of overlap, sarcomere
z disc - ANSWER narrow, plate-shaped regions of dense
materials that separate on sarcomere from the next
a band - ANSWER dark, middle part of sarcomere that extends
entire length of thick filaments & includes those part of thin
filaments that overlap thick filament s
i band - ANSWER lighter, less dense area of sarcomere that
contains remainder of thin filaments but no thick filaments
* z disc passes thru center of each I band
Chamberlain bios 252 exam 1 Questions and Answers with
Verified Solutions
skeletal muscle - ANSWER - long, thin, cylindrical in shape
- multinucleated
- attached to bone & skin
- voluntary
- striated
cardiac muscle - ANSWER - short, fat, branched
- uninucleated
- in heart
- attached to intercalated discs
- involuntary
- striated
smooth muscle - ANSWER - in hollow organs
- ininucleated
- involuntary
- lack striations
,2|Page
excitability - ANSWER responsiveness to chemical signals,
stretch, and electrical changes across the plasma membrane
conductivity - ANSWER local electrical excitation sets off a wave
of excitation that travels along the muscle fiber
contractility - ANSWER shortens when stim
extensibility - ANSWER capable of being stretched b/w
contractions
elasticity - ANSWER returns to its original rest length after being
stretched
organization of skeletal muscle - ANSWER microfilaments,
myofibril, muscle fiber, muscle fascicle, and skeletal muscle
endomysium - ANSWER thin sleeve of loose CT around each
fiber
, 3|Page
perimysium - ANSWER thicker layer of CT that wraps fascicles
fascicles - ANSWER bundles of muscle fibers wrapped together
epimysium - ANSWER fibrous sheath surrounding entire muscle
what are the components of the sarcomere - ANSWER z disc, m
line, a band, i band, zone of overlap, thick filament, thin
filament, zone of overlap, sarcomere
z disc - ANSWER narrow, plate-shaped regions of dense
materials that separate on sarcomere from the next
a band - ANSWER dark, middle part of sarcomere that extends
entire length of thick filaments & includes those part of thin
filaments that overlap thick filament s
i band - ANSWER lighter, less dense area of sarcomere that
contains remainder of thin filaments but no thick filaments
* z disc passes thru center of each I band
