Welcome to the Quiz!
This quiz contains 13 questions from a mix of 1 subtopics.
Which part of the myosin protein attaches to the actin binding sites during contraction?
the myosin hinge
the myosin tail
the myosin head
the myosin body
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Which of the following does NOT change during muscle contraction?
H-zone length
A band length
overlap between actin and myosin
I band length
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What causes the myosin head to detach from actin?
binding of phosphate
release of calcium
binding of ADP
binding of ATP
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Where are calcium ions stored before they are released to initiate contraction?
nucleus
sarcoplasmic reticulum
mitochondria
Golgi apparatus
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How does ATP get replenished during short-burst, high-intensity exercise?
glycolysis
oxidative phosphorylation
pentose phosphate pathway
Krebs cycle
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What causes tropomyosin to move during contraction?
phosphorylation by ATP
action of troponin
binding of calcium ions to tropomyosin
binding of myosin
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Which protein helps to regulate contraction by blocking actin binding sites?
troponin
nebulin
tropomyosin
titin
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What typically provides energy to reset myosin heads during the sliding filament theory of muscle contraction?
diffusion of ATP
oxidation of glucose
breakdown of creatine phosphate
breakdown of ATP to ADP and phosphate
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What pathway produces ATP for prolonged, low-intensity exercise?
aerobic respiration
anaerobic respiration
pentose phosphate pathway
glycolysis
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What causes shortening of the I band during muscle contraction?
breakdown of glycogen
thickening of myosin filaments
increased overlap of actin and myosin filaments
movement of Z-lines
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What is the term for the structures formed when myosin heads bind to actin binding sites?
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Which of the following directly causes tropomyosin to move and expose actin binding sites?
ATP
calcium ions
actin
myosin heads
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What causes skeletal muscle to relax after contraction?
glycogen levels are restored
ATP binds to myosin heads
calcium ions re-enter sarcoplasmic reticulum
lactic acid production ceases
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