The lungs (AQA GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the correct pathway air takes through the respiratory system?
What is the correct pathway air takes through the respiratory system?
Trachea → bronchus → bronchioles → alveoli
What is another name for the trachea?
What is another name for the trachea?
The windpipe
How thick are the walls of the alveoli?
How thick are the walls of the alveoli?
One cell thick
What percentage of oxygen is in inhaled air?
What percentage of oxygen is in inhaled air?
21%
What percentage of carbon dioxide is in exhaled air?
What percentage of carbon dioxide is in exhaled air?
5%
What are the tiny blood vessels that surround each alveolus called?
What are the tiny blood vessels that surround each alveolus called?
Capillaries
How does gas exchange occur in the alveoli?
How does gas exchange occur in the alveoli?
By diffusion
Why does exhaled air contain more water vapour than inhaled air?
Why does exhaled air contain more water vapour than inhaled air?
The surface of alveoli is moist
What do cells need oxygen for?
What do cells need oxygen for?
Respiration
What is the approximate surface area created by millions of alveoli?
What is the approximate surface area created by millions of alveoli?
50-75 m²
Why is it important that alveoli and capillary walls are extremely thin?
Why is it important that alveoli and capillary walls are extremely thin?
So gases have a short diffusion distance
Which gas moves from alveolar air into the blood?
Which gas moves from alveolar air into the blood?
Oxygen