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GCSE Physical Education · key term
Tiny air sacs in the lungs where gaseous exchange takes place.
Used by AQA and OCR
Paper 1
Revise: Gaseous exchangeBreathing brings air into the lungs, but oxygen must then enter the blood so that it can be transported around the body. This transfer happens at the alveoli, tiny air sacs at the ends of the bronchioles. Each alveolus is surrounded by tiny blood vessels called capillaries.
Paper 1
Tiny air sacs at the ends of bronchioles where gas exchange takes place between air and blood.
Revise: Respiratory System Structure and FunctionInside the lungs, the bronchi branch into smaller tubes called bronchioles. These carry air to tiny air sacs called alveoli.
State both the gas and its direction: oxygen moves from the alveoli into the blood; carbon dioxide moves from the blood into the alveoli.
Give the air pathway in order: mouth or nose → trachea → bronchi → bronchioles → alveoli.
Distinguish ventilation, which moves air into and out of the lungs, from gas exchange between the alveoli and blood.
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