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WorksheetsAnatomy of Skeletal Muscle Tissue
Total questions: 20
Worksheet time: 13mins
Select the following skeletal muscle tissue structure in order from SMALLEST to LARGEST:
myofibril, muscle fiber, sarcomere, myofilament
myofilament, myofibril, muscle fiber, sarcomere
myofilament, sarcomere, myofibril, muscle fiber
muscle fiber, myofibril, sarcomere, myofilament
Rodlike contractile organelles that occupy most of the muscle cell volume that contains myofilaments
myofibril
sarcomere
fasicicle
muscle fiber
What is true about myofilament:
has thick filament
has thin filaments
found in myofibrils
responsible for the banding pattern
Spring is like a molecule in sarcomeres that resist overstretching
t tubules
titin
triad
terminal cisterns
properties of thin myofilament
contains actin
attaches to Z disc
consist of large myosin molecules
does not lie in the H zone
properties of thick filaments
attaches to Z disc
contain myosin head
does not lie in the I band
contains myosin
boundaries at two ends of each sarcomere
Z lines
H zone
M line
I bands
these proteins are also found in thin filaments
troponin
actin
tropomyosin
myosin
the central part of the A band, where NO THIN FILAMENT REACH
Z lines
M line
H zone
I bands
the center of the H zone contains tiny rods that hold the thick filamens together
I bands
H zone
Z line
M line
The two regions on either side of the A band. regions that only contain only thin filaments
M line
I band
Z line
A band
What is true about sarcomere
composed of repeating muscle segments in myofibrils
located in the region between two Z lines
where myosin filaments overlap the actin filaments
basic unit contraction in the skeletal muscle system
when does a skeletal muscle fiber contracts?
H band
A band
I band
M line
the function of t tubules in mucle contraction is to
make and store glycogen
release Ca2+ in the cell interior and then pick it up again
transmit an impulse deep into the muscle cell
make proteins
the ions that first enter a msucle cell when an impulse passes over its sarcolemma and then trigger muscle contraction are
calcium
chloride
sodium
potassium
What is TRUE about why is the overlap of the thin and thick filaments essential for muscle contraction?
the myosin head must attach to the overlapping thin filament to generate a contractile force
if there is no overlap, the myosin heads have nothing attach to
it overlaps to only a moderate extent
I don't know
differenciate the neuromuscular junction and motor unit
a neuromuscular junction is the connection between single terminal boutons and a muscle fiber
a motor unit is the connection between single terminal boutons and a muscle fiber
a neuromuscular junction a single motor neuron and all the muscle fibers innervates.
a motor unit a single motor neuron and all the muscle fibers innervates.
Which region of the myofibril changes in length during contraction: the A band, the I band, or the Z disc?
A band
I band
Z disc
M line
According to the sliding filament theory, a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber. When all the sarcomeres in a muscle fiber shorten, the fiber contracts.
True
False
The neurotransmitter that diffuses across the synaptic cleft and binds to receptor molecules on the sarcolemma, where it induces an impulse that initiates fiber contraction
terminal boutons
neuromuscular junction
acetylcholine
motor neurons
