Chapter 10 of 16 · Biology

Gaseous Exchange

Gaseous Exchange is a Biology chapter on the official PMDC MDCAT 2026 syllabus, contributing roughly 4 MCQs to the 81-MCQ Biology section. Mastering the core concepts below typically secures the full chapter weightage.

Key Concepts

• Respiratory tract
• Alveoli & gas exchange
• Hemoglobin & oxygen transport
• Bohr effect
• Plant gas exchange

How Gaseous Exchange Is Tested

MDCAT questions on Gaseous Exchange are a mix of recall (definitions, classifications), application (predict outcomes, interpret diagrams), and basic numerical/analytical reasoning. PMDC papers from 2020–2025 emphasized the concepts above; older UHS papers (2008–2019) tested them too, with slight variations in question framing.