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Blood vessel walls contain elastin, a protein that allows the vessel to stretch under high pressure. Which type of blood vessel do you expect will have the highest concentration of elastin in its walls?

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Answer: Artery

Explanation:

Artery is a type of blood vessel that carry blood (usually oxygenated blood except the pulmonary artery) away from the heart to all parts of the body.

Since, blood from the heart is under high pressure due to the pumping action of the heart muscles, arteries possess elastin, that allows it to stretch under high pressure.

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