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B3.3.5 (HL)—Skeletons as anchorage and levers

Skeletons provide anchorage and lever systems, with vertebrate muscles attached to endoskeletons and arthropod muscles attached inside chitinous exoskeletons securely.

Syllabus
First assessment 2025
Objective
B3.3.5
Level
HL

Exam analysis

Chance of appearing4%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks1–2

Common command terms

  • State
  • Identify
  • Outline
  • Distinguish

Scoring notes

Common mistake
Confusing tendons with ligaments when describing muscle attachment.

Recent exam appearances

May 2025Paper1B ["HL"] · TZ34(c)[ 2 ]B3.3.5 (HL)—Skeletons as anchorage and levers
May 2024Paper2 ["HL"] · TZ15(a)[ 2 ]B3.3.5 (HL)—Skeletons as anchorage and levers
May 2022Paper2 ["HL"] · TZ15(c)[ 1 ]B3.3.5 (HL)—Skeletons as anchorage and levers
November 2016Paper1 ["HL"] · TZ038[ 1 ]B3.3.5 (HL)—Skeletons as anchorage and levers
November 2015Paper2 ["HL"] · TZ03(a)(ii)[ 1 ]B3.3.5 (HL)—Skeletons as anchorage and levers
Practice this objective

Coverage 2015–2025 · Updated 15 Jul 2026

Concept essentials

  • Tendons attach muscles to bones.
  • Skeletal muscles need attachment to a rigid structure to exert force.
  • Vertebrates have internal endoskeletons made of bone and cartilage.
  • Arthropods have external chitinous exoskeletons with muscles attached inside.
ConceptIB Biology HL