Why arteries are elastic
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These need to be elastic because: They are relatively thin compared to their diameter. When the heart contracts, and ejects blood into these arteries, the walls need to stretch to accommodate the blood surge, storing energy.
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Elastic arteries are those nearest the heart (aorta and pulmonary arteries) that contain much more elastic tissue in the tunica media than muscular arteries. This feature of the elastic arteries allows them to maintain a relatively constant pressure gradient despite the constant pumping action of the heart.
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