MDCAT Respiration MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
1
Selected Topics
1
Available MCQs
807
Question Limit
Up to 180
Select Topics to Practice
Questions will be drawn only from checked topics.
Test Configuration
Configure question count (limit 180) and testing mode.
Selected topics have 807 total questions. Test will draw 50 shuffled MCQs.
Sample Respiration MCQs with answers
Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.
Respiratory System
1. The voice box leads to the trachea which is also called:
- A. Bronchi
- B. Bronchioles
- C. Windpipe
- D. Alveolar duct
View answer and explanation
Answer: C. Windpipe
The larynx, or voice box, opens directly into the trachea, the tube that carries air to the lungs and is commonly called the windpipe. The bronchi and bronchioles are the branches inside the lungs, and the alveolar ducts lead to the air sacs. Thus the trachea is also called the windpipe, making C correct.
Respiratory System
2. According to the Bohr effect, a high PC in metabolically active tissues causes:
- A. Hemoglobin to release its oxygen more readily
- B. Hemoglobin to bind oxygen more tightly
- C. The breathing rate to slow down significantly
- D. The formation of more bicarbonate ions in plasma
View answer and explanation
Answer: A. Hemoglobin to release its oxygen more readily
Keyword/Clue: Bohr effect, \textbf{high PCO2 in metabolically active tissues} Concept/Formula: The Bohr effect states that increased \textbf{CO2} (and increased \textbf{H+}/decreased pH) \textbf{reduces hemoglobin's affinity for O2} (right shift of the O2-Hb dissociation curve), so \textbf{O2 is released more readily} in tissues. Why the Other Options Are Wrong: - Option B: High PCO2 decreases (not increases) hemoglobin’s affinity for O2. - Option C: High CO2 typically stimulates ventilation via chemoreceptors rather than slowing breathing. - Option D: CO2 hydration does form bicarbonate, but that describes \textbf{CO2 transport/chemistry} rather than the Bohr effect specifically; the Bohr effect’s key outcome is enhanced O2 unloading.
Respiratory System
3. The trachea is commonly known as the:
- A. Bronchial tree
- B. Windpipe
- C. Voice box
- D. Food pipe
View answer and explanation
Answer: B. Windpipe
The trachea is a membranous tube connecting the larynx to the lungs, commonly known as the windpipe.
About this unit
MDCAT Respiration — Unit 13
807 practice MCQs covering Respiratory System. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Respiration practice
How many Respiration MCQs are available on DIFF. MDCAT?
The current Respiration question bank contains 807 practice MCQs across 1 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Respiration quiz cover?
The selectable topics are Respiratory System. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Respiration test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Respiration quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Respiration MCQs to improve?
Start with a short tutor drill on one of these topics: Respiratory System. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.