IGCSEBiologyCambridge (CIE)Revision Notes11. Gas Exchange in HumansGas Exchange in HumansDifferences in Inspired & Expired Air

Differences in Inspired & Expired Air (Cambridge (CIE) IGCSE Biology): Revision Note

Exam code: 0610 & 0970

Written by: Lára Marie McIvor

Reviewed by: Lucy Kirkham

Updated on 18 June 2026

Differences in Inspired & Expired Air: Extended

Extended Tier Only

Reason for Differences Between Inspired & Expired Air Table

Reasons for Differences in Inhaled & Exhaled Air table, IGCSE & GCSE Biology revision notes

Examiner Tips and Tricks

Make sure you can explain the reasons behind the differences between inspired and expired air, not just recall the differences themselves, this is a common extended-tier requirement.

However, students studying the core content are only required to know the differences in inspired and expired air as covered in the revision note linked here.

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Author: Lára Marie McIvor

Expertise: Content Creator

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.

Reviewer: Lucy Kirkham

Expertise: Content Creator

Lucy has been a passionate Maths teacher for over 12 years, teaching maths across the UK and abroad helping to engage, interest and develop confidence in the subject at all levels.Working as a Head of Department and then Director of Maths, Lucy has advised schools and academy trusts in both Scotland and the East Midlands, where her role was to support and coach teachers to improve Maths teaching for all.