What is cellular respiration?
- Areview of Mr Samuel’s Video
A process of taking glucose and turning it into ATP, energy for the body. Example given was football players who need energy, paying attention in class to sleeping.He then asked, where do we get glucose? We need to consume glucose by what we consume.
How efficient is cellular respiration?
Exam gas engine 75% given of as heat, and 25 % actually generates energy. He used an example of a car, and we are in the car, and we drive for a long time and touch the engine, the engine would burn ones hand. On the other hand, cellular respiration is 40% efficient with 60% given off as heat. Thus the comparison shows that respiration is even more powerful than a car’s engine. Sometimes it is good when the body gives off heat as to keep insulated.
The 3 stages of cellular respiration
Glycolysis, Citric Acid Cycle (krebs cycle, named after a guy named krebs), Electron Transport chain (ETC)
a series of chemical reactions in the cytoplasm or fluid inside the cell and breaking down glucose and ending with pyruvic acid. 4ATP molecules are produced in this process, and 2is used thus a net gain of 2ATP molecules occurs, and 2 mol of NADH
GLUCOSE 6C – using 2 mol ATP, 2ADP->
Intermeadiate stage: following glycolysis pyruvic acid moves into the mitochondria where it undergoes a series of chemical reactions that causes it to lose one CO2 molecule. The intermeadiate product conbines with co-enzyme A to form acetyl-CoA. The lecturer tried to do a rap musical recall this.
The citric Acid Cycle
A series of reaction that break down the Acetyl- CoA to form ATP,NADH, and FADH2. One molecule of ATP is produced, 3 molecules of NADH,1 FADH2 molecule and carbon dioxide. This is similar to the Calvin Cycle.
Noted that each part of the above is important.
Electron Tranport Chain
Is a series of proteins, embedded in the mitochondria membrane. (Smiliar to plant cells)
FADH and NADH carry electrons to the chain. Oxygen is the final electron acceptor in the Electron Transport Chain. Oxygen binds with hydrogen to make water. The ETC produces 36 ATP molecules. ETC is where we get most of our energy in our bodies.