Cell Respiration: Glycolysis, Citric Acid Cycle, Electron Transport Chain

Learning Objectives 

• • Explain the point of doing cellular respiration
  • What is the overall reaction equation for cellular respiration?
    • where do the reactants come from?
    • where do the products go?
  • Draw the places in the cell where each stage of cellular respiration occurs and label the place and the stage 
  • For each stage of cellular respiration: 
    • what's the name of the stage?
    • what goes in? (reactants)
    • what comes Listen Links to an external site. out (products)
    • what's the purpose? (why are these products important?)
    • where does this stage happen within a cell?
  • Electron Transport Chain: 
    • Understand what is the source of energy to  build the proton (H+) gradient. 
    • Explain how the H+ concentration gradient is used to help generate ATP.
    • What is oxygen’s job in the electron transport chain? **don’t say “to make ATP” – that’s ATP synthase’s job.

Details of Cell Respiration 

WARNING:  If you go hunting around the internet, you will quickly see that these are very detailed processes. I have chosen the level of detail that I want you to know and understand.

Assignment 

 I have also created a handout for you to take notes as you follow along in the video below.  Your assignment will be to submit your handout, filled in to the best of your ability. You will probably have some questions!

Fill in this Handout as you watch the video Download Handout as you watch the video

Bring the handout to class and I will check it off if you have done it. 

Three Stages of Cellular  Respiration

There are 4 stages of cellular respiration. Here is a summary of each- you need to watch the video and fill in the handout to learn the details. 

Glycolysis, Acetyl-CoA and the Citric Acid Cycle:

The first 3 stages of cell respiration are all variations on a theme: breaking apart an organic molecule, stripping Hydrogens from the organic molecule to put on an  carrier molecule called NAD+.  Once it has accepted those hydrogens the electron carrier becomes NADH.  

Electron Transport Chain 

In the final stage of the process, the electron carrier, NADH, drops off the Hydrogen- which is broken into the H+ and the electrons. The electrons energize a series of proteins that pump H+ into the mitochondrial matrix. Those H+ flow out through ATP synthase, powering it to make ATP from ADP and P. 

Study Guide Questions 

 Fill in this chart. 

5. 5. Write out the overall equation for Cellular Respiration: The reactants on the left side of the arrow and products on the right side. Note: if something is produced in glycolysis, but used up in the ETC and recycled, it shouldn't be put into this overall equation (ie NADH).  

6.  After several minutes without oxygen, most people will pass out. If they go without oxygen for 4-6 minutes, a person can have brain damage. Use your knowledge of cellular respiration and ATP to explain why this is the case.  Make sure to include the following vocabulary: ATP, work in cells (such as the work of conducting nerve impulses or muscle contraction), oxygen, electron transport chain, ATP synthase, NADH, Citric Acid Cycle, Glycolysis.