1Biologylarynx function
The primary function of larynx is:
- A.Humidifying air
- B.Filtering dust
- C.Gaseous exchange
- D.Voice production
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Respiration MCQs for MDCAT
6 Respiration questions from real MDCAT past papers (2025, 2024, 2023), each with the correct answer and a written explanation.
6 questionsBiology
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2Biologylung capacity
Range of normal total lung capacity in humans is
- A.5-6 liter
- B.8-9 liter
- C.10-11 liter
- D.12-13 liter
Answer and explanation locked
3Biologybacterial respiration
Respiration in Pseudomonas bacteria is
- A.Aerobic
- B.Anaerobic
- C.Facultative
- D.Microaerophili
Answer and explanation locked
4Biologymediastinum definition
The area between the two lungs is called:
- A.Periosteum
- B.Infundibulum
- C.Mediastinum
- D.Hilum
Answer and explanation locked
5Biologyanaerobic respiration effects
Which of the following is NOT a consequence of anaerobic respiration in humans muscles cells?
- A.Cramps
- B.High consumption of energy
- C.Pain
- D.Tiredness
Answer and explanation locked
6Biologyrespiratory surface properties
The respiratory surfaces exhibit following characteristic?
- A.It must be permeable
- B.It must be thick for low diffusion
- C.It should be non-vascularized
- D.It should have low ventilation mechanism
Answer and explanation locked
How Respiration is examined
Respiration sits in the official PMDC Biology curriculum, the document that defines what can and cannot appear in the 2026 paper. Everything on this page is tagged against that curriculum rather than against a chapter list invented for a website, which is why a chapter here matches the chapter your textbook and your teacher use.
Biology carries 81 of the 180 questions in the real paper - 45% of your MDCAT score, and the MDCAT is half your merit aggregate. PMDC does not publish how those 81questions are split across chapters, so no honest page can tell you “expect four from Respiration”. What the archive can tell you is what actually appeared: 6 Respiration questions out of the 361 Biology questions digitised so far.
Work through them with the explanations rather than checking answer letters. The explanation says why the other three options are wrong, and distractors get reused across years far more reliably than whole questions do.
Frequently asked questions
How many Respiration MCQs are on this page?
6, drawn from 4 past papers - the 2023, 2024, 2025 papers. Every one is transcribed from the real paper rather than written to look like a past paper question, and each carries the correct answer with a written explanation. 0 of them are readable in full without an account.
Is Respiration in the MDCAT 2026 syllabus?
Yes. Respiration is a chapter of the official PMDC Biology curriculum, and PMDC has confirmed the 2026 syllabus is unchanged from the 2025 revision, so everything on this page is still examinable.
How many Respiration questions come up in the MDCAT?
PMDC does not publish a per-chapter breakdown, so nobody can tell you a reliable number - be careful with pages that do. What can be counted is the paper as a whole: Biology is 81 of the 180 questions, and 2% of the Biology questions in our archive so far have come from Respiration.
Do these Respiration MCQs come with explanations?
Yes, and they are written from scratch rather than copied. An answer letter tells you nothing about why the other three options are wrong, which is the part that transfers to the next question. The first 0 questions of every paper are free to read in full; the rest need a pass.