These blood vessels have the largest total cross-sectional and surface area.Question 2Answera.Arteriolesb.Capillariesc.Venulesd.Elastic arteriese.Veins
Question
These blood vessels have the largest total cross-sectional and surface area.Question 2Answera.Arteriolesb.Capillariesc.Venulesd.Elastic arteriese.Veins
Solution
The blood vessels that have the largest total cross-sectional and surface area are the capillaries (b).
Here's why:
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The body contains billions of capillaries, and when you add up their cross-sectional areas, it's much larger than that of any other type of blood vessel.
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Capillaries are the smallest and thinnest of the blood vessels in the body and they are the site of the exchange of oxygen and other molecules between the blood and the body's cells.
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The large total cross-sectional area of capillaries reduces the speed of blood flow, allowing more time for exchange of materials.
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Their large surface area allows for rapid exchange of large quantities of materials.
So, the correct answer is b. Capillaries.
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