Capillaries. 1. Microscopic vessels that carry blood from small arteries (arterioles) to small veins (venules). 2. They connect arterioles to venules. 3. The capillary wall is composed of only single layers of cells (endothelium) 4. They have no tunica media or adventitia. 5.. The tunica media (middle layer) contain more elastic fibers (hence the name elastic) than smooth muscle smooth muscle 2. These vessels will conduct (hence the name conducting) blood to the muscular arteries 3. They are designated large because the diameter is larger than the medium sized arteries.
Running shoes may put more strain on your joints than running barefoot or even walking in high heels, a recent study suggests. Humans could perhaps run as fast 40 mph, a new study suggests. Such a feat would leave in the dust the world's fastest runner, Usain Bolt, who has clocked nearly 28 mph in the 100-meter sprint.
Who are the fastest footballers in the world, in terms of sprint speed? Theo Walcott, Rafinha, Messi, Kaka, C Ronaldo, A Cole, Bosingwa, Gareth Bale, Higuain, SWP, Robben, Lennon, Sanchez come to mind.