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What Part of the Myofibril Shortens to Produce Contractions of the Muscle

Question 16
Multiple Choice

What part of the myofibril shortens to produce contractions of the muscle fiber? A) myosin filaments B) A band C) sarcomere D) elastic filaments

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Q 17
When a skeletal muscle fiber contracts: A) Z discs move farther apart while the A bands shorten. B) the H zone and I bands narrow. C) the A bands shorten while the I bands lengthen. D) the H zone narrows while the I bands widen.
Q 18
A muscle cell experiencing resting membrane potential is: A) propagating an action potential. B) more negatively charged on its exterior than in its interior. C) experiencing depolarization. D) polarized.
Q 19
Where should most of the potassium ions be located when a muscle cell is at rest? A) extracellular fluid B) sarcoplasmic reticulum C) tranverse tubules (T -tubules) D) cytosol of the muscle cell
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