During muscle contraction, actin filaments _________.

Question

BlackTom AI · Accepted Answer

The question asks about what actin filaments do during muscle contraction.

Since no list of answer choices is provided in the prompt, I will focus on the statement given in the provided answer field and explain its validity in context.

Actin filaments move toward the M line as part of the sliding filament mechanism. During contraction, the thick myosin filaments pull on the thin actin filaments, causing the actin fibers to slide inward toward the center of the sarcomere. This inward sliding shortens the sarcomere and brings the Z lines closer together, resulting in muscle shortening. The movement of actin relative to the M line is consistent with the coordinated shortening of the entire sarcomere.

If we were evaluating multiple choices, we would assess each option for accuracy:
- An option stating that actin filaments move toward the M line would be correct, reflecting the sliding of actin inward during contraction.
- An option claiming actin radiates away from the M line would be incorrect, as contraction shortens the sarcomere and brings actin toward the center, not outward.
- An option suggesting actin remains stationary while myosin moves would be an oversimplification; while the relative sliding is due to cross-bridge cycling, the net effect at the sarcomere level includes actin displacement toward the M line.
- An option implying actin depolymerizes or disassembles during normal contraction would be false; contraction relies on intact actin filaments and cross-bridge cycling, not filament disassembly.

In summary, the mechanism involves actin filaments sliding inward toward the M line as the sarcomere shortens, which aligns with the classical sliding filament model of muscle contraction.

BIOL&170 21097 Module 4 Quiz

During muscle contraction, actin filaments _________.

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BIOL&170 21097 Module 4 Quiz

During muscle contraction, actin filaments _________.

View Explanation

Log in for full answers

Similar Questions

Question at position 24 In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and __________. myosin actin tropomyosin troponin

A marathon runner started experiencing muscle cramps towards the end of the race. This is thought to be due to electrolyte loss. Which of the following is most critical for muscle contraction?

Application-Level Multiple-Choice Items​ Magnesium is an important mineral that works with calcium in the body to:​

The antagonist muscle(s) passively __lengthen __during the lifting phase and passively __shorten __during the lowering phase. To lift (or push or pull) a resistance the agonists are _concentrically __ contracting, to control the resistance back down the agonists are __eccentrically __ contracting.

More Practical Tools for Students Powered by AI Study Helper

Making Your Study Simpler

Application-Level Multiple-Choice Items Magnesium is an important mineral that works with calcium in the body to:

The antagonist muscle(s) passively lengthen during the lifting phase and passively shorten during the lowering phase. To lift (or push or pull) a resistance the agonists are _concentrically contracting, to control the resistance back down the agonists are eccentrically __ contracting.