MDCAT Circulation MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
4
Selected Topics
1
Available MCQs
312
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 312 total questions. Test will draw 50 shuffled MCQs.
Sample Circulation 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.
Heart Structure
1. The contractions of heart are initiated by
- A. A.V Node
- B. S.A Node
- C. Right Atrium
- D. Somatic nervous system
View answer and explanation
Answer: B. S.A Node
The contractions of the heart are initiated by the SA node, a patch of specialized cardiac muscle in the wall of the right atrium that acts as the natural pacemaker. It spontaneously generates rhythmic electrical impulses that spread over the atria and cause them to contract. The AV node only relays and slightly delays these impulses to the ventricles, while the somatic nervous system does not initiate the heartbeat, which is why B is correct.
Lymphatic System
2. Which sequence correctly traces lymph back to blood?
- A. Lymphatic capillaries → larger lymphatic vessels → lymphatic ducts → large veins
- B. Blood capillaries → lymphatic ducts → heart valves → arteries
- C. Lymphatic ducts → arteries → capillaries → ventricles
- D. Lymph nodes → aorta → pulmonary artery → veins
View answer and explanation
Answer: A. Lymphatic capillaries → larger lymphatic vessels → lymphatic ducts → large veins
Lymph moves from small blind-ended capillaries through vessels and ducts into the venous circulation.
Blood Vessels
3. A healthy average blood pressure reading for an adult is often cited as:
- A. 120/80 mmHg
- B. 140/90 mmHg
- C. 100/70 mmHg
- D. 90/60 mmHg
View answer and explanation
Answer: A. 120/80 mmHg
A healthy adult blood pressure is conventionally cited as approximately 120/80 mmHg (systolic/diastolic). 140/90 mmHg marks the hypertension threshold, 100/70 is on the low side of normal, and 90/60 suggests hypotension. The 120/80 value is the long-standing reference standard for normal adult pressure.
About this unit
MDCAT Circulation — Unit 11
920 practice MCQs covering Heart Structure, Cardiac Cycle, Blood Vessels, Lymphatic System. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Circulation practice
How many Circulation MCQs are available on DIFF. MDCAT?
The current Circulation question bank contains 920 practice MCQs across 4 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 Circulation quiz cover?
The selectable topics are Heart Structure, Cardiac Cycle, Blood Vessels, Lymphatic 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 Circulation 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 Circulation 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 Circulation MCQs to improve?
Start with a short tutor drill on one of these topics: Heart Structure, Cardiac Cycle, Blood Vessels. 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.