Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
Which part of the myosin protein attaches to the actin binding sites during contraction?
the myosin head
the myosin body
the myosin hinge
the myosin tail
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Which of the following does NOT change during muscle contraction?
H-zone length
overlap between actin and myosin
I band length
A band length
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What causes the myosin head to detach from actin?
binding of phosphate
binding of ATP
binding of ADP
release of calcium
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Where are calcium ions stored before they are released to initiate contraction?
sarcoplasmic reticulum
Golgi apparatus
mitochondria
nucleus
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How does ATP get replenished during short-burst, high-intensity exercise?
oxidative phosphorylation
glycolysis
pentose phosphate pathway
Krebs cycle
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What causes tropomyosin to move during contraction?
binding of myosin
phosphorylation by ATP
action of troponin
binding of calcium ions to tropomyosin
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Which protein helps to regulate contraction by blocking actin binding sites?
troponin
tropomyosin
titin
nebulin
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What typically provides energy to reset myosin heads during the sliding filament theory of muscle contraction?
oxidation of glucose
diffusion of ATP
breakdown of creatine phosphate
breakdown of ATP to ADP and phosphate
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What pathway produces ATP for prolonged, low-intensity exercise?
anaerobic respiration
glycolysis
aerobic respiration
pentose phosphate pathway
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What causes shortening of the I band during muscle contraction?
breakdown of glycogen
increased overlap of actin and myosin filaments
movement of Z-lines
thickening of myosin filaments
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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?
myosin heads
actin
ATP
calcium ions
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