Portal hypertension is a term used to describe elevated pressures in the portal venous system (a major vein that leads to the liver). Portal hypertension may be. caused by intrinsic liver disease, obstruction, or structural changes that result in increased portal venous flow or increased hepatic resistance.
Quick Answer. Tumblebooks are pre-existing picture books in e-reader format that have added animation effects, narrated story and dialogue, enhanced sounds and music appropriate to the story. This content engages children and encourages them as they learn to read. Adults and children can read the books or have them read by the program.
According to the American movies, tumbleweed is as American as apple pie. But tumbleweed is not a native American. It's a Russian invader, that was first discovered in Australia. On our recent trip through Central Australia, we saw lots of tumbleweed.