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GCSE Physical Education · key term
A dome-shaped muscle beneath the lungs that contracts and flattens during inhalation and relaxes during exhalation.
Used by AQA and OCR
Paper 1
Revise: Mechanics of breathingThe diaphragm is a sheet of muscle beneath the lungs. When relaxed, it curves upwards into a dome. Together, these muscles change the volume of the chest cavity: the space within the rib cage containing the lungs and heart.
Paper 1
A sheet of muscle beneath the lungs that contracts and flattens during inhalation and relaxes into a dome during normal exhalation.
Revise: Respiratory System Structure and FunctionThe diaphragm is a sheet of muscle beneath the lungs. When relaxed, it has a dome shape. The intercostal muscles lie between the ribs and help move the rib cage.
For an explanation, link muscle action → rib and diaphragm movement → chest volume → air pressure → direction of airflow.
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