Oklahoma football notebook: Lane Johnson, Bronson Irwin provide latest O-line scares - Article Photos 32/47

Iowa State's Durrell Givens (24) tackles Oklahoma's Jalen Saunders (18) after a catch during a college football game between the University of Oklahoma (OU) and Iowa State University (ISU) at Jack Trice Stadium in Ames, Iowa, Saturday, Nov. 3, 2012. Photo by Nate Billings, The Oklahoman