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.
From the arteries, blood enters smaller branches of arteries called arterioles and then the capillary network. Just as arterioles are smaller branches of arteries, so venules are smaller branches of veins. Venules receive blood from the capillaries and branch into veins that return blood to the heart. They do not have the need for the strength and elasticity of the arteries, so the walls of the veins are thin and almost floppy. To make up for this, many veins are located in the skeletal muscles, and the least movement of a limb squeezes the vein and drives the blood toward the heart.