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Biology

GCSE · AQA

QuestionsFlashcards

Communicable Diseases
Monoclonal Antibodies
- Producing Monoclonal Antibodies
  6
- Uses of Monoclonal Antibodies
  7
Plant Disease
- Detection and Identification of Plant Diseases
  6
- Plant Defence Responses
  6

The Lungs Flashcards

All 6 cards in this deck

Name, in order, the structures air passes through from the throat to the gas exchange surface in the lungs.: Trachea → bronchi → bronchioles → alveoli.
Where in the lungs does gas exchange take place?: In the alveoli (tiny air sacs).
Give three features of the alveoli that maximise gas exchange.: Large surface area; walls one cell thick; a large capillary network (good blood supply).
At the alveoli, which gas diffuses into the blood and which diffuses out?: Oxygen diffuses from the alveoli into the blood; carbon dioxide diffuses from the blood into the alveoli.
Why is each alveolus surrounded by a network of capillaries?: It gives a good blood supply, which keeps a steep concentration gradient so gases diffuse quickly.
True or false? Blood leaving the capillaries around the alveoli is deoxygenated.: False. It leaves the lungs oxygenated and travels to the heart in the pulmonary vein.