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

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The question asks: in the sliding filament model of muscle contraction, the myofilaments slide past one another, leading to overlapping between actin and which filament?
Option 1: myosin. This is the correct pairing, as the overlap occurs between thin filaments (actin) and thick filaments (myosin) during contraction.
Option 2: actin. This is incorrect because actin is the thin filament that slides along the thick filament; the question already specifies actin as one of the filaments involved, so overlapping actin with actin would not make sense in this context.
Option 3: tropomyosin. Tropomyosin is a regulatory protein that runs along actin filaments to cover myosin-binding sites in relaxed muscle; it is not the filament that directly overlaps with actin during the sliding process.
Option 4: troponin. Troponin is another regulatory complex attached to actin and tropomyosin, controlling access to binding sites in response to calcium; it is not a separate filament that overlaps with actin during contraction.
In summary, the classic model emphasizes the interaction and overlap between actin (thin filament) and myosin (thick filament) as contraction proceeds, whereas the other options describe regulatory components or the same filament rather than the opposing filament involved in the overlap.

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

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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

查看解析

登录即可查看完整答案

类似问题

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.

What is explained by the sliding filament theory?

更多留学生实用工具

希望你的学习变得更简单

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.