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Edexcel A-Level Biology A2 7.11 Sliding Filament Theory Questions

Explain skeletal muscle contraction from calcium binding to troponin and tropomyosin movement, then link myosin cross-bridges, ATP hydrolysis and sarcomere shortening.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • explain how calcium, troponin and tropomyosin expose actin binding sites
  • describe ATP binding and hydrolysis during myosin release and power strokes
  • interpret sarcomere or force evidence through cross-bridge formation and overlap

Edexcel A-Level Biology A2 7.11 Sliding Filament Theory Questions question 1

[Maximum number: 3]

Movement in mammals results from interactions between muscles, tendons, ligaments and bones.

The graph shows the relationship between the force of muscle contraction and the velocity of muscle contraction.

Figure for Question Edexcel A-Level Biology A2 7.11 Sliding Filament Theory Questions question 1 — Edexcel A-Level Biology A2

The greater the number of cross bridges formed between actin and myosin the greater the force of contraction of a muscle.

Explain the relationship between the force and the velocity of contraction of a muscle.
(3)

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