MDCAT Biology — Respiration
Respiration is a core Biology topic in the PMDC MDCAT syllabus, covering 5 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (5)
- Anatomy
- Effect of Smoking
- Gas Exchange in Lungs
- Human Physiology - Respiration
- Human Respiratory System
How Respiration is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Respiration accounts for 26 questions. It appears in 14 of them, about 1.9 questions a paper. The heaviest was MDCAT 2018, with 4 questions, and the most recent is MDCAT 2025, with 1.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 1 |
| MDCAT 2024 | 1 |
| MDCAT 2023 | 1 |
| MDCAT 2022 | 1 |
| MDCAT 2019 | 2 |
| MDCAT 2018 | 4 |
| MDCAT 2017 | 2 |
| MDCAT 2016 | 2 |
| MDCAT 2015 | 2 |
| MDCAT 2013 | 1 |
| MDCAT 2012 | 1 |
| MDCAT 2010 | 3 |
| MDCAT 2009 | 2 |
| MDCAT 2008 | 3 |
Respiration MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Respiration
The primary function of larynx is:
- A.Humidifying air
- B.Filtering dust
- C.Gaseous exchange
- D.Voice production
Show answer
Answer: D. Voice production — The larynx's primary function is voice production.
- Q2 · MDCAT 2024 · Respiration
About 70% of the carbon dioxide is carried in blood as:
- A.Carbonate
- B.Bicarbonate
- C.Tricarbonate
- D.Carbonic anhydrase
Show answer
Answer: B. Bicarbonate — About 70% of blood CO2 is carried as bicarbonate ions (HCO3-).
- Q3 · MDCAT 2023 · Respiration
The method of bringing oxygenated air into contact with a gas exchange surface is called:
- A.Photorespiration
- B.Ventilation
- C.Gas transport
- D.Respiration
Show answer
Answer: B. Ventilation — Ventilation is the process of moving air so that oxygenated air comes into contact with the gas exchange surface.