By SoulSurvivorsGaming, writer at creators.co. DC and Marvel have dominated the comic book industry for decades now, causing millions of people to have a beloved list of their favorite superheroes and characters from those universes. Characters including: Batman, Iron Man, Spider-Man, Superman and even Aqualad.
There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. Theyâre tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
A vein is a blood vessel that has a larger lumen, and sometimes veins serve as blood reservoirs or capacitance vessels, containing valves that prevent backflow. This system of vessels in general returns blood to the heart from the periphery (see the image below). Veins: blood flow and valve structure.