CourseCourseConceptConceptDocsDocuments

IB Biology HL B3.3.3 Hl Titin and Antagonistic Muscles Questions

Explore how amino-acid R-group chemistry changes solubility, interactions, folding and protein function in IB Biology HL B1.2.6.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how titin centres myosin in a sarcomere, stores elastic potential energy, recoils after stretching and limits overstretching.
  • Explain why antagonistic muscles are required: one muscle actively contracts to pull a joint while the opposing muscle relaxes, producing opposite movements.
  • Apply flexor-extensor opposition to elbow or insect-joint diagrams by identifying biceps/triceps actions, attachment and the resulting flexion or extension.

IB Biology HL B3.3.3 Hl Titin and Antagonistic Muscles Questions 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 IB Biology HL B3.3.3 Hl Titin and Antagonistic Muscles Questions 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 ]
All question bank results loaded