Free Circulation MCQs with Answers
695 Circulation MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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Read the Circulation notesFree MDCAT chapter notes with key terms695 questions · page 29 of 35
561. With respect to their relation with rest of the body, the lower chambers of human heart act as:
- A. Expulsion pump
- B. Suction pump
- C. Dual pump
- D. Reservoir
Explanation: As right ventricle pushes out the blood to pulmonary artery for pulmonary circulation whereas left ventricle pushes it to aorta for…
Correct answer: Expulsion pump- A. Tricuspid valve
- B. Bicuspid valve
- C. Semilunar valve
- D. Mitral valve
Explanation: It is right atrioventricular valve having three flaps. Tricuspid valve is present between the right atrium and the right ventricle for the…
Correct answer: Tricuspid valve- A. Fibrous cords
- B. Fibrous cords called chordae tendineae
- C. Fibrous cords called ligaments
- D. Epithelial extensions
Explanation: The flaps (cusps or leaflets) of the tricuspid valve are attached to the papillary muscles of the right ventricle by means of chordae…
Correct answer: Fibrous cords called chordae tendineae- A. Left and right pulmonary veins
- B. Left and right pulmonary trunks
- C. Left and right pulmonary arteries
- D. Superior and inferior venae cavae
Explanation: The pulmonary trunk is subdivided into two branches known as the left and right pulmonary arteries.
Correct answer: Left and right pulmonary arteries- A. Left atrium
- B. Right atrium
- C. Left ventricle
- D. Right ventricle
Explanation: After oxygenation in the lungs, the oxygenated blood is brought by pulmonary veins to the left atrium of the heart.
Correct answer: Left atrium- A. Aorta
- B. Pulmonary trunk
- C. Pulmonary artery
- D. Pulmonary vein
Explanation: When the left ventricle contracts, it pushes the blood through the aortic valve into the aorta and then to all parts of the body.
Correct answer: Aorta- A. Liver
- B. Spleen
- C. Heart
- D. Gut
Explanation: Coronary arteries supply blood to the heart muscle itself. The heart, like any other organ, requires a constant supply of oxygen and…
Correct answer: Heart- A. Two branches
- B. Three branches
- C. Four branches
- D. Five branches
Explanation: Before descending down through the thoracic and abdominal regions, the aortic arch gives off three main branches.
Correct answer: Three branches- A. Different parts of alimentary canal
- B. Kidneys
- C. Lower abdomen
- D. Different parts of alimentary canal, kidneys and Lower abdomen
Explanation: After arching towards left behind the heart aorta covers the chest area through bronchial arteries and then enters into the abdominal…
Correct answer: Different parts of alimentary canal, kidneys and Lower abdomen- A. Aorta
- B. Pulmonary trunk
- C. Superior vena cava
- D. Inferior vena cava
Explanation: Superior vena cava is the largest vein in the body that collects deoxygenated blood from the upper part of the body like head, neck, chest…
Correct answer: Superior vena cava- A. Renal veins
- B. Femoral veins
- C. Iliac veins
- D. Hepatic veins
Explanation: The femoral veins join together to form the common iliac vein, which then joins the opposite common iliac vein to form the inferior vena…
Correct answer: Iliac veins- A. Superior vena cava
- B. Inferior vena cava
- C. Hepatic portal vein
- D. Jugular vein
Explanation: Renal veins drain kidneys and pour the deoxygenated blood into inferior vena cava.
Correct answer: Inferior vena cava- A. A
- B. B
- C. C
- D. D
Explanation: Tricuspid has 3 valves which are only present in A.
Correct answer: A- A. A
- B. B
- C. C
- D. D
Explanation: Bicuspid valve has 2 flaps which is present in B.
Correct answer: B- A. Bicuspid valves
- B. Tricuspid valves
- C. Bicuspid and tricuspid valves
- D. Semilunar valves
Explanation: The "dubb" sound is produced by the closure of the aortic and pulmonary valves, which are the semilunar valves.
Correct answer: Semilunar valves- A. 2-5 billion times
- B. 1-5 billion times
- C. 2-5 million times
- D. 1.5 million times
Explanation: 2-5 billion times as per statistical evaluation given in text book.
Correct answer: 2-5 billion times- A. Pulmonary artery
- B. Pulmonary veins
- C. Inferior vena cava
- D. Superior vena cava
Explanation: All veins carry deoxygenated blood except pulmonary veins, which carry blood from lungs to the left atrium.
Correct answer: Pulmonary veins- A. One systole
- B. One diastole
- C. One systole and one diastole
- D. One systole and two diastoles
Explanation: Two upper chamber (atria) contract in a single step and both lower chambers (ventricles) relax at that time, then both lower chambers…
Correct answer: One systole and one diastole- A. P wave
- B. T wave
- C. QRS wave
- D. S wave
Explanation: A normal electrocardiogram (ECG) indicates that the heart is functioning properly.
Correct answer: QRS wave- A. Atrial diastole
- B. Atrial systole
- C. Ventricular diastole
- D. Ventricular systole
Explanation: When ventricles contract, blood is pushed through aorta to arterial system and highest blood pressure is generated as the walls of…
Correct answer: Ventricular systole