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.
When Victor A. McKusick, M.D., first described Marfan syndrome in 1955, he predicted that these patients with serious ocular, musculoskeletal and cardiovascular problems would eventually be found to have a mutation in a structural connective tissue protein.