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 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
I band length
A band length
overlap between actin and myosin
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What causes the myosin head to detach from actin?
release of calcium
binding of ATP
binding of phosphate
binding of ADP
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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?
Krebs cycle
glycolysis
oxidative phosphorylation
pentose phosphate pathway
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Which protein helps to regulate contraction by blocking actin binding sites?
troponin
titin
tropomyosin
nebulin
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What typically provides energy to reset myosin heads during the sliding filament theory of muscle contraction?
breakdown of creatine phosphate
breakdown of ATP to ADP and phosphate
oxidation of glucose
diffusion of ATP
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What pathway produces ATP for prolonged, low-intensity exercise?
glycolysis
anaerobic respiration
pentose phosphate pathway
aerobic respiration
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What causes shortening of the I band during muscle contraction?
increased overlap of actin and myosin filaments
thickening of myosin filaments
breakdown of glycogen
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?
actin
myosin heads
calcium ions
ATP
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What causes skeletal muscle to relax after contraction?
calcium ions re-enter sarcoplasmic reticulum
glycogen levels are restored
lactic acid production ceases
ATP binds to myosin heads
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