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IB Biology HL 3.3.3 Antagonistic Muscles Question Bank

Practise IB Biology HL 3.3.3 by explaining antagonistic elbow muscles and how titin supports sarcomere recoil and relaxation.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain flexor-extensor opposition at the elbow using biceps, triceps and joint movement.
  • Relate titin elasticity to sarcomere recoil and abnormal muscle relaxation.

B3.3.3 (HL)—Titin and antagonistic muscles question 1

[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 B3.3.3 (HL)—Titin and antagonistic muscles question 1 — IB Biology HL

Question (a)

(a)

Outline a reason for the muscles being described as antagonistic.

[ 1 ]

Question (b)

(b)

Describe the role of muscle Y.

[ 2 ]
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