Which of the following is a major risk factor for coronary heart disease?
Correct answer A. Cigarette smoking
Topic / 50 questions
Circulation MCQs
Circulation MCQs are multiple-choice questions on the human transport system, covering the structure of the heart, the cardiac cycle, arteries, veins and capillaries, blood and the lymphatic system. Every question on MCQs360 shows the correct answer instantly, so you can check each answer and learn from mistakes straight away.
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
A person’s blood pressure is 120/80 mmHg. What is the approximate mean arterial pressure, using MAP = diastolic + ⅓(pulse pressure)?
Correct answer B. 93 mmHg
The instrument used to measure arterial blood pressure is the ____.
Correct answer B. sphygmomanometer
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Hypertension is generally diagnosed when resting blood pressure is persistently at or above about ____.
Correct answer A. 140/90 mmHg
Approximately what percentage of the volume of blood is plasma?
Correct answer C. 55%
Mature human red blood cells are biconcave and lack a nucleus. This mainly helps them to ____.
Correct answer C. carry more haemoglobin and exchange gases efficiently
What is the average lifespan of a human red blood cell in the circulation?
Correct answer C. About 120 days
Which is the most abundant type of white blood cell in normal human blood?
Correct answer A. Neutrophil
Platelets (thrombocytes) are formed from fragments of which large bone marrow cells?
Correct answer B. Megakaryocytes
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A person with blood group O Rh-negative is called a universal donor because their red cells ____.
Correct answer C. carry no A, B or Rh(D) antigens
Which blood group has both A and B antigens on its red cells and no anti-A or anti-B antibodies in its plasma?
Correct answer A. AB
Haemolytic disease of the newborn can occur when ____.
Correct answer D. an Rh-negative mother carries a second Rh-positive foetus after being sensitised
Lymph from most of the body, including the left side and both legs, finally drains into the blood through the ____.
Correct answer A. thoracic duct into the left subclavian vein
Lymph capillaries differ from blood capillaries in that they ____.
Correct answer B. begin blindly (closed at one end) in the tissues
Lacteals in the villi of the small intestine are lymph vessels that absorb mainly ____.
Correct answer C. fats in the form of chylomicrons
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What is the main function of lymph nodes?
Correct answer D. Filtering lymph and housing lymphocytes that respond to pathogens
Which lymphoid organ is the site where T lymphocytes mature?
Correct answer D. Thymus
Which is the largest lymphoid organ in the body and also removes old red blood cells?
Correct answer A. Spleen
Gross swelling of the legs in elephantiasis is caused by ____.
Correct answer D. blockage of lymphatic vessels by filarial worms
Atherosclerosis is best described as ____.
Correct answer D. deposition of fatty plaques containing cholesterol in the inner walls of arteries
About Circulation MCQs
Heart questions cover its chambers, valves, coronary blood supply and the conducting system of the SA node, AV node, bundle of His and Purkinje fibres. Cardiac cycle questions ask about the phases of atrial and ventricular systole and diastole, heart sounds and the length of one cycle at a given heart rate. The blood vessels section compares the structure and function of arteries, veins and capillaries and explains how tissue fluid forms. Other questions deal with blood components and groups, haemolytic disease of the newborn and cardiovascular disorders such as atherosclerosis. The lymphatic system section covers lymph nodes, lacteals, the thoracic duct and lymphoid organs.
Key facts to remember
- At a heart rate of 75 beats per minute, one cardiac cycle lasts about 0.8 seconds.
- The sinoatrial (SA) node in the wall of the right atrium acts as the heart's pacemaker.
- The left ventricle has the thickest wall because it pumps blood around the whole body.
- The pulmonary artery carries deoxygenated blood, and the pulmonary veins carry oxygenated blood.
- The heart muscle receives its own blood supply through the coronary arteries.
- Lymph from most of the body drains into the blood through the thoracic duct, which joins the left subclavian vein.
Exams that include Circulation MCQs
Pakistan
- MDCAT
- NUMS
- AKU
- FSc boards
India
- NEET
Bangladesh
- HSC
- Medical Admission Test
How to prepare for Circulation MCQs
- Draw the heart with its chambers, valves and major vessels, and trace the path of a red blood cell through it.
- Learn the cardiac cycle as a timeline, noting which valves are open or closed in each phase.
- Compare arteries, veins and capillaries in a table showing wall thickness, lumen size, valves and pressure.
- Revise the exceptions, such as the pulmonary artery and pulmonary veins, as examiners use them in tricky options.
Frequently asked questions
Which exams ask Circulation MCQs?
In Pakistan, Circulation questions appear in MDCAT, the NUMS and AKU entry tests and FSc board papers. Students in India meet the same content in NEET, and in Bangladesh it is tested in HSC Biology and the Medical Admission Test.
Why do veins have valves while arteries do not?
Blood in veins flows at low pressure, so valves are needed to stop it flowing backwards, especially in the limbs where blood returns to the heart against gravity. Arteries carry blood at high pressure from the heart, so backflow is not a problem along their length.
What is the function of the lymphatic system?
The lymphatic system returns excess tissue fluid to the blood, absorbs fats from the small intestine through lacteals and helps defend the body. Lymph nodes filter lymph and contain lymphocytes and macrophages that destroy pathogens.
Last reviewed October 2026