• Question: What are blood vesels made of

    Asked by 684heam32 to Pattie on 23 Feb 2018. This question was also asked by bella.
    • Photo: Pattie Mathieu

      Pattie Mathieu answered on 23 Feb 2018:

      Blood vessels are made of long stringy proteins called collagen (which provides structure) and elastin (which is stretchy like a rubber band). There are also cells. Smooth muscle cells make up most of the vessel wall and contract to regulate blood pressure. Endothelial cells line the insides of the blood vessels.

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