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 Breckenridge, Texas, population is 5,731. There are 1,377 people per square mile (population density). The median age is 36.1. The US median is 37.2. 58.45% of people in Breckenridge, Texas, are married. 10.94% are divorced. The average household size is 2.6 people. 31.61% of people are married, with children. 25.83% have children, but are single. 81.70% of people are white, 1.68% are black, 0.30% are asian, 0.09% are native american, and 15.37% claim 'Other'.