...the equator. Arteries, veins, and capillaries are...
...vessels. Arteries and veins are distinguished by...
...heart toward capillaries. Veins return blood to...
...exception is portal veins, which carry blood...
...venules converge into veins. Metabolic rate is...
...and back via veins to the atrium...
...via the pulmonary veins to the left...
...venules and then veins. Oxygen-poor blood from...
...capillaries, arteries, and veins. Capillaries have a...
...Both arteries and veins have two layers...
...the walls of veins. The thicker walls...
...body. The thinner-walled veins convey blood back...
...flows through the veins mainly because skeletal...
...squeeze blood in veins. Within larger veins,...
...veins. Within larger veins, flaps of tissues...
...to venules and veins, it speeds up...
...arteries than in veins and is highest...
...blood reaches the veins, its pressure is...
...the walls of veins and venules account...
...blood through the veins. One-way valves built...
...valves built into veins ensure that blood...
...and other large veins near the heart...
...into the large veins of the circulatory...
...Lymph vessels, like veins, have valves that...
...lymphatic capillaries. Like veins, lymph vessels depend...
...in the pulmonary veins, its PO2 has...