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mylabsplus chp 9
Terms in this set (20)
Which of the following muscle types is/are both voluntary and striated?
skeletal muscle only
Muscle cells initiate nerve impulses.
Which of the following is present in muscle cells but absent in most other cell types?
Muscle cells have myoglobin; most other cells do not.
The final "go" signal for skeletal muscle contraction is __________.
an increase in intracellular calcium ion levels
The __________ are inward invaginations of the sarcolemma that run deep into the cell and ensure that every myofibril in the muscle fiber contracts at virtually the same time.
The thin myofilaments of skeletal muscle are composed chiefly of __________.
breaks down acetylcholine
Myofibrils are composed of repeating contractile elements called __________.
Which of the following statements is FALSE?
During contraction, thin filaments slide past thick filaments so that actin and myosin filaments do not overlap.
When an action potential arrives at the neuromuscular junction, the most immediate result is __________.
the release of acetylcholine from the motor neuron
If a muscle is applied to a load that exceeds the muscle's maximum tension, __________.
the muscle length will not change during contraction
Properly controlled skeletal muscle contractions produced by changing the frequency of stimulation and the strength of stimulation are referred to as __________.
graded muscle responses
The most efficient means of producing ATP for muscle contraction is __________.
What would occur if a contracting muscle became totally depleted of ATP?
The muscle would remain in a contracted state because of an inability to break actin-myosin cross bridges.
slow oxidative muscle fiber =
fast glycolytic muscle fiber=
moderately fatigue resistant
fast oxidative muscle fiber=
Which of the following is FALSE regarding smooth muscle?
Once damaged, smooth muscle is unable to regenerate.
Choose the true statement.
Smooth muscle depends on the calcium-calmodulin system to regulate contraction, while skeletal muscle relies on the calcium-troponin system to regulate contraction.
Duchenne muscular dystrophy is more common in females than in males.
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