Pressure with which the blood flows in arteries decreases as it travels to veins and finally capillaries. Based on this statement, which among the three are the narrowest blood vessels?
A
Arteries
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B
Veins
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C
Capillaries
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Solution
The correct option is C Capillaries As blood flows under high pressure in arteries, artery walls are the thickest to withstand the pressure. As the pressure decreases, becoming the least in capillaries, they are the narrowest blood vessels. Capillary walls are only one cell thick that helps in the easy exchange of materials between blood and body cells.