policies over the past few decades have helped fragment MexicoвЂ™s political order, the film looks at the ways in which the country has been weighed down by disorder and crime throughout the 21st century.Д¬losely following a caravan of migrants - some with young children - as they travel from Honduras, Guatemala and other Central American nations across Mexico toward the United States, the film depicts the daily struggles of life on the road without certainty of a better future. With the trademark inside access unique to National Geographic and the filmmakers, BLOOD ON THE WALL explores the internal and external influences on Mexico as it deals with the key issues of migrant caravans from Central America heading to the U.S., the dangerous but resilient traffickers fueling the cross-border drug trade and how corruption has impacted politics at every level.ДЇeaturing unprecedented first-person accounts from migrants on the road, farmers, narcos, security enforcers, journalists, presidents and diplomats, BLOOD ON THE WALL tells the story of how traffickers, corrupt politicians and well-positioned business interests have seized wealth and power, leaving everyday citizens desperately fighting for survival or needing to flee elsewhere for a better life.Д®xploring MexicoвЂ™s tension with its northern neighbor and the way regional U.S.

The largest arteries have special elastic fibres in their walls.WASHINGTON-( BUSINESS WIRE)-National Geographic Documentary Films announced today that the new feature documentary, BLOOD ON THE WALL, from Academy AwardВ® nominee and best-selling author, journalist and filmmaker Sebastian Junger and EmmyВ®-winning filmmaker Nick Quested, will premiere Wednesday, September 30, at 9/8c on National Geographic. Arteries carry blood away from the heart to other organs.

There are five main types of blood vessels: arteries, arterioles, capillaries, venules and veins. Because the walls of the veins are thinner and less rigid than arteries, veins can hold more blood. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has less pressure than in the arteries. The walls of veins have the same three layers as the arteries. It is a thin layer of simple, or single-layered, squamous cells called endothelial cells. Endothelium refers to cells that line the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.

Similarly, what is the inner lining of a blood vessel called? Endothelium. In terms of physiological control, vascular smooth muscle is layered between two regulatory systems. The blood vessel wall consists of a single layer of endothelial cells that provides an interface between the blood and the smooth muscle forming the medial layer. Regarding this, what is found in the walls of blood vessels?

Because capillaries are only one cell layer thick, they only have a tunica intima. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia. The innermost layer is called the tunica intima. All arteries and veins contain three layers.

Blood on a wall