Exam skills
What the paper asks you to do
- Compare inhalation with exhalation
- Explain alveolar adaptations
- Interpret breathing-rate or volume data
Human systems
Human gas exchange
Use pressure, muscle action and diffusion to explain ventilation and exchange at the alveoli.5090 syllabus routeConcept · skill · exam language
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Your study notes
What to know
Build the topic around four anchors.
- 01Airway structure
- 02Ventilation mechanics
- 03Alveolar exchange
- 04Effects of exercise and smoking
Common mistakes
Where marks disappear
- Confusing ventilation with respiration
- Reversing diaphragm movement
- Saying oxygen is pumped into blood
Turn this topic into a clear answer.
Write your response, reveal the teaching points, and check your own reasoning.
Practise this topic’s structured questions ↗Structured practice
Answer these without looking back.
For each prompt, write the biological chain clearly enough that every mark-worthy link is visible.
- 01Explain inhalation using pressure changes.
- 02Describe three alveolar adaptations.
- 03Interpret breathing data before and after exercise.
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This independent teaching resource follows the Cambridge O Level Biology 5090 syllabus direction and is not endorsed by Cambridge International Education.