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Multiple Choice
A) sodium ions
B) calmodulin
C) potassium ions
D) myosin
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Multiple Choice
A) Creatine phosphate must be regenerated.
B) Lactic acid must be repleted.
C) Glycogen stores must be depleted.
D) Creatine phosphate must be depleted.
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Multiple Choice
A) concentric
B) eccentric
C) isometric
D) fatiguing
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Multiple Choice
A) excitability
B) muscle mass
C) tension
D) sarcomere number
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Multiple Choice
A) decreased acetylcholine production by the motor neuron
B) relaxation of the muscle fibre
C) excessive, continuous stimulation of the muscle fibre
D) inability of the motor neuron to stimulate the muscle fibre
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True/False
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True/False
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Multiple Choice
A) It can store small amounts of CO2.
B) It increases the rate of O2 transfer from blood into muscle fibres.
C) It is abundant in fast glycolytic fibres.
D) It is abundant in slow red fibres.
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Multiple Choice
A) Binding ATP will bind actin and myosin.
B) Binding ATP will detach actin and myosin.
C) Binding calcium will bind actin and myosin.
D) Binding calcium will detach actin and myosin.
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Multiple Choice
A) to bind Ca2+
B) to form attachments with myosin cross bridges
C) to serve as an ATPase
D) to prevent myosin cross bridges from attaching to thin filaments
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True/False
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Multiple Choice
A) In skeletal muscle, calcium ion mediates changes in thin filaments that lead to cross-bridge activity; in smooth muscle, calcium ion mediates changes in thick filaments that lead to cross-bridge activity.
B) In skeletal muscle, troponin and tropomyosin are regulatory proteins; in smooth muscle, troponin is the only regulatory protein on thick filaments.
C) In skeletal muscle, calcium ion binds to troponin; in smooth muscle, calcium ion binds to calmodulin.
D) In skeletal muscle, calcium ion binds to calmodulin; in smooth muscle, calcium ion binds to troponin.
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