Biology · 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
C
Correct answer
Explanation
The human vascular system is incredibly extensive. The total length of blood vessels (including arteries, veins, and especially capillaries) is estimated at around 60,000 miles in an average adult. This includes the vast network of capillaries where gas and nutrient exchange occurs.
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16,90,000 miles
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16,70,000 miles
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16,50,000 miles
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16,80,000 miles
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Tissues taken from a dead body
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Tissues taken from a living body
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Blood from veins
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Blood from arteries
B
Correct answer
Explanation
Biopsy is a medical procedure where living tissue is removed from the body for microscopic examination to diagnose diseases, particularly cancer. It must be performed on a living body where cellular architecture and metabolic activity are preserved. Post-mortem tissue analysis is called an autopsy, not a biopsy.
A
Correct answer
Explanation
The pulmonary artery is the only artery that carries deoxygenated blood. It transports blood from the right ventricle of the heart to the lungs for oxygenation (pulmonary circulation). After receiving oxygen in the lungs, the blood returns to the heart via the pulmonary veins, which are the only veins carrying oxygenated blood. All other arteries carry oxygenated blood, and all other veins carry deoxygenated blood.
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blood-vessel
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wasteful
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marked by vulgar lewd humor
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stop or check flow of blood
A
Correct answer
Explanation
An artery is a blood vessel that carries oxygenated blood away from the heart to various parts of the body (except for pulmonary arteries). Option B (extravagant) relates to 'arteriosclerosis' but is not the meaning of 'artery' itself. Options C and D are unrelated.
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Blood flows with high velocity in the body.
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Direct exchange of materials between the cells and the blood in the body.
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RBCs are absent in the blood.
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The blood flows from the heart into the arteries.
A
Correct answer
Explanation
In open circulatory system, the blood usually flows at a very low velocity and at low pressure as the smooth muscles are absent .
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Blood flows at high speed.
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The blood itself increases the efficiency of circulation.
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The blood flows in blood vessels only.
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The volume of blood is independent of the muscles of the blood vessels.
D
Correct answer
Explanation
In this type of circulatory system, the volume of blood flowing through any organ of the body is regulated by the contraction and relaxation of the muscles of the blood vessels.
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Left atrium
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Right atrium
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Ventricle
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1 and 2
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None of the above
A
Correct answer
Explanation
In amphibians and reptiles, the left atrium receives oxygenated blood from the gills/lungs/skin.
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Trachea
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Bronchus
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Diaphragm
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Alveoli
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Bronchiole
D
Correct answer
Explanation
This is the correct option. Alveoli has very thin walls and are supplied with blood capillaries.
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closed
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open
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heterogenic
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All of the above
A
Correct answer
Explanation
The vascular system of frog is well-developed closed type. Frogs have a lymphatic system also. The blood vascular system involves heart, blood vessels and blood.
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epithelial tissues
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connective tissues
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muscular tissues
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nervous tissues
A
Correct answer
Explanation
Blood vessels are covered by epithelial tissues.
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The elastic arteries are the major branches of aorta.
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The systemic and pulmonary circulations are perfused in series.
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Perfusion of the systemic circulation requires a much higher pressure.
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Blood re-enters the heart through the venae cavae.
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The cardiovascular system electrolytes to the body cells and nullify thermoregulation.
E
Correct answer
Explanation
The key functions of the cardiovascular system are:
Distribution of O2, water, electrolytes and nutrients to all body tissues; transportation of CO2 and metabolic waste products from the tissues to the lungs and kidneys; and thermoregulation.
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coronary sulcus
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pericardial sinus
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sternocostal surface
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fibrous pericardium
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serous pericardium
B
Correct answer
Explanation
It refers to the wall at the back of the pericardial sac. It acts as a collection reservoir to isolate oxygenated haemolymph entering the heart.
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capillaries
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endothelium
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arteriole
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artery
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aorta
A
Correct answer
Explanation
A venule is a very small blood vessel in the microcirculation that allows blood to return from the capillary beds to the larger blood vessels called veins. Venules range from 8 to100 μm in diameter, and are formed when capillaries unite together. Many venules unite to form a vein.
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Heart
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Lungs
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Pancreas
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Liver
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Kidney
B
Correct answer
Explanation
The deoxygenated blood is pumped from heart to the lungs. When we breathe in air, it contains oxygen. The gases dissolved in the alveoli of the lungs are passed through the membrane of the alveoli into the capillaries. In the capillaries, the red blood cells containing haemoglobin will bind to the oxygen molecules thus making the blood oxygenated again.