Diffusion & the alveoli (Edexcel 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 type of transport is diffusion?
What type of transport is diffusion?
Passive transport
In which direction do particles move during diffusion?
In which direction do particles move during diffusion?
High to low concentration
Which gas diffuses from the alveoli into the blood?
Which gas diffuses from the alveoli into the blood?
Oxygen
How does temperature affect the rate of diffusion?
How does temperature affect the rate of diffusion?
Higher temp increases rate
What happens to diffusion when the distance is shorter?
What happens to diffusion when the distance is shorter?
Diffusion is faster
How does a larger surface area affect diffusion?
How does a larger surface area affect diffusion?
Increases rate of diffusion
How thick are the walls of the alveoli?
How thick are the walls of the alveoli?
One cell thick
Why do the lungs contain millions of alveoli?
Why do the lungs contain millions of alveoli?
To provide large surface area
What does ventilation do for gas exchange in the alveoli?
What does ventilation do for gas exchange in the alveoli?
Maintains concentration gradient
According to Fick's Law, rate of diffusion is inversely proportional to what?
According to Fick's Law, rate of diffusion is inversely proportional to what?
Thickness of membrane
Why is diffusion slow in large multicellular organisms?
Why is diffusion slow in large multicellular organisms?
Distance is too great
What helps gases dissolve before diffusing across the alveolar membrane?
What helps gases dissolve before diffusing across the alveolar membrane?
Moist lining