The diagram shows an athlete extending their left elbow while throwing a javelin. According to the sliding filament theory, which occurs in the muscle fibres of the athlete’s left triceps?

[Source: Eric Shamus, Jennifer Shamus: Sports Injury Prevention & Rehabilitation www.accessphysiotherapy.com Copyright
© McGraw-Hill Education. All rights reserved.]

A. The H zone increases.

B. The A band shortens.

C. The Z lines move closer together.

D. The A band lengthens.

C

This question was a little more challenging as candidates were required to consider the changes in the sarcomere during a specific sporting action. G2 form comments have suggested that some images are unnecessary. In light of accessibility and inclusivity some images are included to help candidates appreciate the context of the question. Although the images may not always be required for candidates to answer questions, they are often used to ensure candidates are not disadvantaged by limited exposure to the varying sport/exercise examples.