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).
Hays County is a populous suburban county in the Austin metropolitan area, with a population of 176,000 people and 55,000 jobs. The county has grown faster than the metro and the U.S.: the population grew 51% from 2003-2013 with the job base growing 49%. The countyâs population growth is primarily due to the migration of people into the county: from 2003 to 2013, 77% of new population was due to domestic migration.