Hoping to rebound from their road loss to the Texans, the Steelers went home for a Week 5 intraconference duel with the Tennessee Titans.  Pittsburgh trailed early in the first quarter as Titans kicker Rob Bironas got a 29-yard field goal, yet the Steelers answered with quarterback Ben Roethlisberger finding tight end Heath Miller on an 8-yard touchdown pass.  Pittsburgh would add onto their lead in the second quarter with Roethlisberger hooking up with wide receiver Hines Ward and fullback David Johnson on a 7-yard and a 1-yard touchdown pass. The Steelers continued their dominating day in the third quarter with Roethlisberger connecting with Ward again on a 5-yard touchdown pass.  Tennessee responded with running back Chris Johnson getting a 1-yard touchdown run.  Afterwards, the Steelers would pull away in the fourth quarter with a 19-yard field goal from kicker Shaun Suisham.  The Titans tried to rally with quarterback Matt Hasselbeck completing a 19-yard touchdown pass to wide receiver Damian Williams, yet Pittsburgh closed out the game with Roethlisberger finding wide receiver Mike Wallace on a 40-yard touchdown pass.. How many touchdowns did Roethlisberger throw for?