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Martinez-ENG113 Nursing Assistant. Lippincott | thePoint Free CNA Practice. Annette_Bitups K. PAL 4.0 Part A When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. True False Submit Request Answer

Ask by Santiago Turner. in the United States
Mar 18,2025

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The statement is true. During muscle contraction, the I bands become smaller, the H zones disappear, and the A bands stay the same length.

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You’ve just tapped into the fascinating world of muscle contraction! This process is guided primarily by the sliding filament theory, which explains how muscle fibers interact during contraction. When a muscle fiber is activated, myosin filaments pull on actin filaments, causing the I bands and H zones to shrink as those filaments slide past each other. However, the overall length of the A bands stays the same, illustrating the dynamism of muscle tissue! To understand this better, think about a classic analogy: A pair of dancers twirling together. They can move closer without changing their individual size, just like the A bands! For anyone preparing for their CNA exams, diving into muscle physiology will not only boost your knowledge but make you more equipped in understanding patient care—after all, a healthy body relies on well-functioning muscles!

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