Choose a historic steam train or one of our eco-friendly biodiesel locomotives for your train ride on the only Cog Railway East of the Rockies! Advance booking is recommended. Check our train schedule here. Download Cog RW Brochure [1.32 MB pdf]
There are two types of blood vessels in the circulatory system of the body: arteries that carry oxygenated blood from the heart to various parts of the body and veins that carry blood towards the heart for purification.hey are tiny branches of arteries that lead to capillaries and help maintain the pressure and blood flow in the body. Venous valves prevent blood from flowing in the opposite direction. Connective tissues make up the outermost layer of a vein which is also known as-tunica adventitia or tunica externa.
The following diagram summarises the sequence of blood flow through the heart, arteries, arterioles, capillaries, venules, veins, then back to the heart: The following diagram summarises the structural differences between different types of blood vessels.More information about this also follows in the next section.enules. Venules are minute vessels that drain blood from capillaries and into veins. Many venules unite to form a vein. 1  Drains blood from capillaries into veins, for return to the heart.