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).
Texas Population History. The 2010 confirmed figure of 25,145,561 represented an increase of 20.6% from the 2000 numbers of 20,851,820. Like most states across the US, the population of Texas has increased from its very birth but percentage rises are fairly constant with the recent 20.6% increase being a fairly typical figure.