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IB Biology HL B2.3.9 Hl Cardiac and Striated Muscle Questions

Explore how gap junctions synchronize branched cardiac cells and how striated muscle fibres use nuclei, myofibrils and mitochondria for contraction in IB Biology HL B2.3.9.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how branching, intercalated discs and gap junctions allow cardiac muscle cells to conduct impulses and contract synchronously.
  • Compare cardiac and skeletal striated muscle using branching, nuclei, sarcomeres and cell architecture.
  • Relate myogenic activity, mitochondria and myofibrils to the demands of sustained cardiac or skeletal-muscle contraction.

Learn this topic

Study B2.3.9 (HL)—Cardiac and striated muscle conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL B2.3.9 Hl Cardiac and Striated Muscle Questions question 1

[Maximum number: 1]

Which features are found in both cardiac and striated muscle?

A

Nuclei and branched myofibrils

B

Sarcomeres and unbranched myofibrils

C

Mitochondria and branched myofibrils

D

Sarcomeres and mitochondria

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