Biology A-Level
diffusion at the alveolus
What diffusion at the alveolus means in Biology A-Level, as defined for AQA.
Definition of diffusion at the alveolus
Check what you remember
Read the wording for your board, then hide it and explain diffusion at the alveolus in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Oxygen diffusing from the alveolus into the blood and carbon dioxide diffusing the other way, each across the alveolar epithelium and the capillary endothelium.
Topics that use diffusion at the alveolus
- Gas exchange (AQA A-Level)
Related terms
- antagonistic intercostal muscles
- Bronchioles
- Correlation
- counter-current flow
- large surface area
- Lungs
- maintaining a concentration gradient
- mesophyll and stomata
Using diffusion at the alveolus in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge