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GCSE Physical Education · key term
A muscle at the side of the neck that helps expand the chest during inspiration in exercise.
Used by AQA
Paper 1
Revise: Mechanics of breathingFor inspiration, the pectorals, at the front of the upper chest, and the sternocleidomastoid muscles, at the sides of the neck, contract to help expand the chest further. The lungs can therefore expand more than during breathing at rest, allowing more air in.
Distinguish relaxed expiration at rest from forced expiration during exercise. Name the pectorals and sternocleidomastoid for exercise inspiration, and the abdominals for exercise expiration.
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