The pyloric sphincter prevents the regurgitation of chyme from the duodenum into the stomach. It also controls the flow of chyme into the intestine, which provides the intestines with a manageable volume of chyme from which to absorb nutrients.
Pittsburgh star James Conner diagnosed with cancer. Conner says he has Hodgkin lymphoma, but he vows to play again.
Jerome Lejeune, a French geneticist who discovered the chromosome abnormality in humans that causes Down syndrome, a common form of mental retardation, died on April 3 in Paris. He was 67 and lived in Paris.erome Lejeune, a French geneticist who discovered the chromosome abnormality in humans that causes Down syndrome, a common form of mental retardation, died on April 3 in Paris. He was 67 and lived in Paris.