also check out http://www.nfs.uvm.edu/nfs-new/activities/tutorials/krebscycle.html

"the role of krebs cycle in metabolism:"

at the bottom of the page you can navigate to either glycolysis or ETC

http://www.rsc.org/Education/Teachers/Resources/cfb/respiration.htm

Now take a look at Figure 5.19 on page 187 of your textbook

Notice, after the 6 carbon molecule we "make" and NADH (it is being reduced) and we are "oxidizing" the six carbon molecule because it loses a CO2.

If this still doesn't make sense, use this tutorial to get a deeper understanding.

http://www.nfs.uvm.edu/nfs-new/activities/tutorials/krebscycle.html

hit start, and then "understanding redox reactions"

think about what does it mean "TO BE an OXIDIZER" vs "to be oxidized"

If you are confused, use this tutorial to help you understand better.

The answers you seek...may be in this tutorial.

( I would skip the step by step Krebs review)

http://www.nfs.uvm.edu/nfs-new/activities/tutorials/krebscycle.html

http://www.mheducation.ca/school/applets/abbio/quiz/ch05/how_the_krebs_cycle_wor.swf

Watch this video either on your own, or with your partner to further understand the Krebs cycle: Understanding Krebs #5(start at 2:43, this guy doesn’t show the three places where you get the NADHs from):

https://www.youtube.com/watch?v=O6bInBQXtmM

Again, READ page 187 where it says Krebs cycle and try to relate it back to figure 5.19

I STRONGLY SUGGEST YOU USE THIS TUTORIAL ( I would skip the step by step Krebs review):

http://www.nfs.uvm.edu/nfs-new/activities/tutorials/krebscycle.html

Understanding Glycolysis-Krebs-ETC together: https://www.youtube.com/watch?v=Gh2P5CmCC0M (start at 5:12)

Read Electron Transport Page 187 - 188. - ETC Best video: https://www.youtube.com/watch?v=g44wSRU5LXY