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IB Biology HL B3.3 Muscle and Motility Hl Only Questions

Practise IB Biology HL B3.3 muscle and motility through sarcomeres, joint movement, skeletons, motor end plates and evidence from diagrams.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • explain how actin, myosin, calcium ions and ATP contribute to sarcomere contraction
  • compare skeleton types and relate tendons, muscles and joints to force and movement
  • interpret diagrams or practical contexts involving joints, antagonistic muscles and motion range

Covered syllabus points

B3.3.1 (HL)—Movement adaptationsB3.3.2 (HL)—Sliding filament modelB3.3.3 (HL)—Titin and antagonistic musclesB3.3.4 (HL)—Motor unitsB3.3.5 (HL)—Skeletons as anchorage and leversB3.3.6 (HL)—Synovial joint movementB3.3.7 (HL)—Range of motionB3.3.8 (HL)—Intercostal musclesB3.3.9 (HL)—Reasons for locomotionB3.3.10 (HL)—Swimming adaptations in marine mammals

Learn this topic

Study B3.3 Muscle and motility [HL only] conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 7]

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 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 ]

Question (c)

(c)

Outline how the muscle attachment of insects differs from humans.

[ 1 ]

Question (d)

(d)

Explain the role of calcium ions in muscle contraction.

[ 3 ]

Question 2

[Maximum number: 1]

What happens when an action potential reaches motor end plates?

A

Calcium ions are absorbed by the muscle fibres.

B

The sarcomeres relax.

C

Neurotransmitter is released.

D

Action potential is passed to the neuron.

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