No valves exist between the anterior vena cava and the heart, and the heartbeat tends to cause movement within this blood vessel. Another vessel, the posterior vena cava, carries blood from the lower half of the body to the heart.
The 2016 Hereford, Texas, population is 15,021. There are 2,447 people per square mile (population density).
Austin is the capital of Texas. It is the fifteenth most populous city in the United States.     As of 2009, the population of Austin, Texas is 757,668 in the city â¦ and 1,669,000 in the metropolitan area. 4 people found this useful. William Galloway. GI Brat and former member of the US Army.