For Oakland Raiders quarterback Derek Carr his rookie season has been an extended lesson.

The only rookie quarterback to start every game this season, Carr left Sunday's 31-13 drubbing at Kansas City -- one of his worst performances of the season -- with an education. The Chiefs put constant pressure on Carr and he was never able to get comfortable. Now he knows there will be days like that.

"When you get hit early, a lot of times in your natural ability, you just got hit in the face and it's like, 'Oh man, is it going to be like this all day?' You learn a lot about yourself, like I've said a lot this year," Carr said. "I learned about myself that I can continue to stand in there and take the hits and make the throws I need to make, make the reads I need to make. That is going to pay off so much. There is so much that goes on when those hits happen and you come to the sideline and know you have to go back out there. There is so much in your head that goes on. It's good to know that I can do this all day. It's really cool, too, when other people notice it. Older, veteran teammates come up to you and say something about how that's going to pay off for you, and how it's good to see. That kind of stuff is encouragement. That was the biggest take away. It was good."

In other Raiders notes:

The Raiders have put 13 players on injured reserve this season, including nine on defense. Interim coach Tony Sparano said that gave the team an opportunity to look at young players such as defensive linemen Denico Autry and Ricky Lumpkin, who otherwise likely wouldn't get a look.

The Raiders are tied with the Jets and the Chiefs with 11 takeaways. It's the fewest in NFL.

The Raiders added receiver Greg Jenkins, who has been in the program before, and defensive back Vernon Kearney to the practice squad.

Practice squader Spencer Hadley went back to working at linebacker because Raiders have just four active linebackers. He has been getting reps at fullback lately.