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
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Dorsal aorta
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Renal vein
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Renal artery
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Posterior vena cava
A
Correct answer
Explanation
Blood of dorsal aorta in mammals carries the least percentage of urea.
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more in veins and less in arteries
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more in arteries and less in veins
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same
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not definite
B
Correct answer
Explanation
pH of blood in arteries is more and less in veins because of their gaseous combinations as ateries contain oygenated blood and veins contain deoxygenated blood.
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endothelium, connective tissue and muscle fibres
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endothelium and muscles fibres
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endothelium and connective tissue
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endothelium only
D
Correct answer
Explanation
Blood capillaries are made of endothelium only.The blood capillaries are where the important functions of the circulation take place: the exchange of material between circulation and cells.
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pure blood to lungs
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impure blood to lungs
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pure blood to the intestine
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None of the above
B
Correct answer
Explanation
The pulmonary artery carries impure blood to lungs.It is one of the only arteries (other than the umbilical arteries in the fetus) that carries deoxygenated blood.
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three semilunar valves
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two semilunar valves
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one semilunar valve
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four semilunar valves
A
Correct answer
Explanation
The opening of truncus arteriosus in frog is guarded by three semilunar valves.
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Arteries of body
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Capillaries surrounding the alveoli
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Left auricle of heart
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Capillaries surrounding the tissues
D
Correct answer
Explanation
The maximum amount of oxygen lost from blood is in capillaries surrounding the tissues.
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muscles
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bones
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capillaries
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ligaments
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cartilage
C
Correct answer
Explanation
Arteries and veins are joined by a network of capillaries.
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Artery
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RBC
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WBC
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Vein
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Platelet
B
Correct answer
Explanation
RBC contains haemoglobin.
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Their shape remains the same in all the classes of vertebrates.
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They are larger in size than the white blood corpuscles.
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Their life span is so short as 120 hrs.
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They adhere and pile up in resting and slow flowing blood.
D
Correct answer
Explanation
Their pile up structure is called rouleaux.
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It is released from a clot.
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It is a clear fluid.
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It lacks corpuscles and fibrogens.
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It has the tendency to coagulate.
D
Correct answer
Explanation
They have clotting proteins and, therefore, can undergo coagulation.
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Muscular tissue
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Connective tissue
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Epithelial tissue
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Nervous tissue
B
Correct answer
Explanation
Blood is a vascular connective tissue.
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The blood flows through blood vessels.
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The blood flows very slowly in the vessels.
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Blood has high pressure in the vessels.
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The blood comes in direct contact with the tissues.
B
Correct answer
Explanation
The blood flows very fast in the vessels.
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They are empty after the death of the animal.
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They do not collapse even after being cut.
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Their walls are thin and contain valves.
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Their blood flow is fast and intermittent.
C
Correct answer
Explanation
They have valves to prevent the back flow of blood.
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The blood flow is very fast.
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The blood pressure is very high.
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The blood flows through the sinuses.
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The blood never comes in direct contact with the tissues.
C
Correct answer
Explanation
Sinuses are open tissue spaces.
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They take blood from various body parts to the heart.
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They carry deoxygenated blood towards the heart.
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They carry blood with high pressure.
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They are located superficially.
C
Correct answer
Explanation
They circulate blood in the whole body. For this, the blood has high pressure.