Unit 2: Form and Function
Topic 2.8: Muscle and Movement (HL) Questions
Practice 20 exam-style questions for IB Biology Topic 2.8. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
Which statement best describes how a skeletal muscle produces movement?
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A sarcomere is the functional contractile unit of striated muscle.
Which structures mark its two ends?
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State which protein makes up the thin filaments of a sarcomere and which structure these thin filaments are anchored to.
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In a relaxed muscle fibre, what prevents the myosin heads from attaching to actin?
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State the name of the contractile unit of a muscle — the smallest repeating structure that shortens to produce the muscle's pull.
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In a sarcomere, which protein makes up the thin filaments that are anchored to the Z-discs?
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According to the sliding filament model, what changes when a muscle contracts?
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Which part of a synovial joint has the role of reducing friction on the surfaces where the bones meet?
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Two muscles act on opposite sides of a joint, so that when one contracts to bend the joint the other relaxes, and vice versa.
What is this arrangement called?
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State the action of the biceps and the action of the triceps on the elbow joint.
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State the names of the two regulatory proteins of the thin filament that control whether myosin can bind to actin.
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State the name given to the functional contractile unit of striated muscle that lies between two adjacent Z-discs.
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Why must skeletal muscles work in antagonistic pairs to move a joint?
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Which connective tissue attaches a muscle to a bone so that the muscle's pull moves the bone?
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Calcium ions released into the cytoplasm of a muscle fibre bind directly to which protein?
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To straighten (extend) the arm at the elbow, what happens to the biceps and triceps?
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Unlock Question17Explain3 marks
A single sarcomere shortens by only a tiny amount during contraction.
Explain how the shortening of many sarcomeres produces a noticeable shortening of the whole muscle.
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Outline the role of titin in the structure and function of a sarcomere.
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A structure joins a muscle to a bone so that the muscle's pull turns the bone.
Which structure is this?
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The diagram shows the sliding-filament arrangement of a sarcomere.
During the power stroke, in which direction do the myosin heads move the actin (thin) filaments?
[Diagram: bio-sarcomere]
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