Font size
WorksheetsCH 10: skeletal muscle cells and friends
Total questions: 22
Worksheet time: 24mins
What causes skeletal muscle cells to contract?
acetylcholine
calcium
atp
sodium
What is the place called where a motor neuron stimulates a muscle cell?
motor end plate
sarcomere
t-tubules
synaptic cleft
How are skeletal muscle cells are electrically insulated from each other?
the endomysium
the epimysium
the perimysium
mitocondria
What is a motor neuron?
a specialized type of brain cell called neurons located within the spinal cord and the brain.
a specialized type of skeletal cell called neurons located within the spinal cord and the brain.
a specialized type of muscle cell called neurons located within the spinal cord and the brain.
a specialized type of skin cell called neurons located within the spinal cord and the brain.
What part of the motor neuron carries impulses to the muscle?
axon
python
t-tubules
synaptic cleft
Match the following:
Invaginations of the sarcolemma penetrating deep into the
interior of the muscle cell.
t-tubules
The space between the axon terminal and the motor end
plate.
synaptic cleft
The swollen distal end of the motor neuron axon.
axon terminal
The muscle cell membrane.
sacrolemma
Match the following:
Structures within the axon terminal that contain the
neurotransmitter acetylcholine.
Synaptic Vessicles
The contractile unit of the muscle cell that extends from one
Z line to the next.
sacromere
Structures within skeletal muscle cells that serve as
reservoirs of calcium ions.
terminal cisternae
A folded region of the sarcolemma at the neuromuscular
junction.
motor end plate
Where is myosin found in skeletal muscle cells?
thick filaments
thin filaments
in the T tubules
in the terminal cisternae
Each tubulin subunit on actin contains binding sites for
(it is plural)
(a)
Which of the following will attach to myosin?
(a)
Which of the following will attach to actin?
tropinin
tropomyosin
ATP
calcium ions
What causes the release of calcium ions into the cytosol from the terminal cisternae?
(a)
What happens after the tropomyosin moves over, exposing the binding sites on the actin (a)
What happens to the myosin head (cross bridge when the power stroke occurs)?
pulls on actin and it slides to the M line
pulls on actin and it slides to the axon terminal
pulls on myosin and it slides to the M line
pulls on myosin and it slides to the axon terminal
What would happen all the myosin cross bridges were synchronized (doing the same
thing at the same time)?
you die
you spaz out
rigor mortis
the muscle collapses
Muscles can continue to contract unless they run out of (a) or (b)
Reorder the following: Muscle Contraction
Nerve releases a neurotransmitter (acetylcholine)
Neurotransmitter causes the muscle cell membrane gates to open
•Ions (Na+ & K+) exchange places causing the sarcoplasmic reticulum to release Ca2+
This release of Ca+ starts the muscle contraction as the actin filaments slide past the myosin filaments
Reorder the following: Sliding Filament Theory
Ca2+ causes thick myosin filaments to form crossbridges with the thin actin filament by exposing the binding site on actin
the crossbridges change shape as it pulls on filaments which slides towards the center of the sacromere in the power stroke
The crossbridges detach from the actin filament when ATP bonds to myosin head
The myosin head gets ready to bond to actin again using ATP energy
aerobic
anaerobic
anaerobic with glucose breakdown
less than 15 seconds
long lasting
30-60 seconds
creates 2 atp
creates lactic acid
uses glucose and 6o2
creates 6co2 and 6h2o and atp
creatine phosphate + adp <> CP + Atp
label the microfilament
m line
i band
z disc
a band
h zone
label the fascicle
sarcolemma/plasm
perimysium around fasicle
endomysium
mitocondria
myofibril
label the thin filament
tropinin
actin
tropomyosin
myosin binding site
