IB Biology HL 3.3.2 Skeletal Muscle Contraction Question Bank

Practise IB Biology HL 3.3.2 by analysing sarcomere micrographs and linking troponin, calcium, ATP and filament sliding to contraction.

Exam points

Interpret sarcomere bands and micrographs to explain filament sliding and length changes.
Explain calcium-troponin control, ATP cycling and actin-myosin cross-bridge formation.

[Maximum number: 3]

The diagram shows a section through part of the leg of an insect and antagonistic muscles X and Y . The tibia moves in the direction shown by the arrow when the muscle is flexing.

Figure for Question B3.3.2 (HL)—Sliding filament model question 1 — IB Biology HL

Explain the role of calcium ions in muscle contraction.

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B3.3.2 (HL)—Sliding filament model question 1