Biology ยท General Awareness
Human Circulatory System
846 Questions
The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.
Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply
Human Circulatory System Questions
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Septa
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Valves
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Arteries
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Veins
B
Correct answer
Explanation
Valves in the heart act as one-way doors that prevent blood from flowing backward into the previous chamber after it has been pumped forward.
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arteries
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heart
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veins
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lymphatic vessels
A
Correct answer
Explanation
Arteries carry blood away from the heart under high pressure, so they do not require valves. Veins, heart chambers, and lymphatic vessels all utilize valves to maintain unidirectional flow.
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aorta
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pulmonary artery
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pulmonary vein
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vena cava
A
Correct answer
Explanation
The aorta is the main artery that carries oxygenated blood from the left ventricle of the heart to the rest of the body.
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Artery
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Vein
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Lymphatic vessels
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Capillary
D
Correct answer
Explanation
Capillaries are the smallest blood vessels, with walls only one cell thick, allowing for the efficient exchange of gases and nutrients.
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prevent backflow of blood
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increase surface area
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increase blood pressure
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absorb blood
A
Correct answer
Explanation
Veins carry blood back to the heart under low pressure; valves are necessary to prevent the backflow of blood due to gravity.
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left atrium
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left ventricle
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right atrium
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right ventricle
A
Correct answer
Explanation
Oxygenated blood returns from the lungs via the pulmonary veins and enters the left atrium of the heart.
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thinner wall
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valves present in them
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wide lumen
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all of these
D
Correct answer
Explanation
Compared to arteries, veins have thinner walls, wider lumens, and contain valves to facilitate blood return to the heart.
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oxygenated blood to lungs
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deoxygenated blood to heart
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deoxygenated blood to lungs
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oxygenated blood to heart
C
Correct answer
Explanation
The pulmonary artery is unique because it is the only artery that carries deoxygenated blood from the heart to the lungs for oxygenation.
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Factor II
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Factor IX
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Factor X
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Factor V
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Factor XIII
C
Correct answer
Explanation
It is also known as the Stuart factor and helps in producing prothrombokinase complex.
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Factor IV
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Factor VI
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Factor IX
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Factor V or proaccelerin
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None of these
B
Correct answer
Explanation
This factor is a hypothetical activation product of proaccelerin (Factor V) and is probably nonexistent.
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Superior vena cava
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Right pulmonary artery
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Inferior vena cava
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Left subclavian artery
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Coronary sinus
C
Correct answer
Explanation
Inferior vena cava brings deoxygenated blood from lower and middle parts of the body for its purification.
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Aortic valve
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Tricuspid valve
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Semilunar valve
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Bicuspid aortic valve
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Mitral valve
C
Correct answer
Explanation
Semilunar valves allow one way passage of blood from ventricles to arteries.
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External elasticlamina
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Endothelium
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Tunica adventitia
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Tunica intima
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Tunica media
C
Correct answer
Explanation
It is made up of longitudinally oriented fibrous connective tissues having collagen and elastin fibres, fibroblasts, etc.
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Extraorganismic
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Parenchymal
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Intracellular
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Coelomic
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Blood vascular
E
Correct answer
Explanation
Due to the presence of a separate circulatory system, this system is insulated from pollutants, chemicals, and acidic and alkaline materials.
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Haematology
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Arrhythmia
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Angioplasty
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Angiology
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Cardiology
D
Correct answer
Explanation
This is the study of blood vascular system including arteries, veins and heart.