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).
The 2014 Kerrville, Texas, population is 22,344. There are 1,101 people per square mile (population density). The median age is 46. The US median is 37.2. 48.74% of people in Kerrville, Texas, are married. 14.23% are divorced. The average household size is 2.22 people. 18.20% of people are married, with children. 23.02% have children, but are single.