1. Cellular Respiration!

2. How does cellular respiration work
How does cellular respiration work? Cells take energy, such as that in the chemical bonds in food, and incorporate it into the chemical bonds of ATP

3. This creates the energy needed to do work.
RESPIRATION
The process by which mitochondria break down food molecules to produce ATP is called...
CELLULAR RESPIRATION
This creates the energy needed to do work.

4. Where does this take place?
In the mitochondria of the cell!

5. The chemical equation for respiration is… C6H12O6 + 6O2  6CO2 + 6H2O + ATP

6. Heterotrophs vs. Autotrophs
In heterotrophs, large food molecules are broken down into smaller ones, such as glucose, in a process called digestion.
What did you digest today???

7. In autotrophs, food is already in its usable form, glucose, as a result of PHOTOSYNTHESIS

8. These glucose molecules are the fuel for cellular respiration
During cellular respiration, glucose molecules are broken down to release energy.
This energy is used to produce…
ATP!!!

9. 2 Types of Respiration
Aerobic Respiration: Happens when OXYGEN is present
Anaerobic Respiration: Happens when oxygen is in short supply or there is no oxygen!

10. Glycolysis
This is the first step for BOTH of the 2 main types of respiration - aerobic and anaerobic respiration

11. Glycolysis
C6H12O6 is broken down into two 3-carbon molecules of a substance called pyruvic acid
Location: cytoplasm
It does NOT require oxygen
(anaerobic process)
It provides 2 ATP in
addition to the
pyruvic acid

12. Fermentation
Second step in anaerobic respiration (happens in absence of oxygen)
The function of fermentation is to break down pyruvic acid (formed in glycolysis) and regenerate NAD+ for reuse in glycolysis, where ATP is formed

13. Fermentation The combination of glycolysis and fermentation is called
anaerobic respiration.
Glycolysis + Fermentation =
Anaerobic Respiration

14. Two Types of Fermentation
Lactic acid fermentation adds hydrogen atoms to pyruvic acid to produce lactic acid. It occurs in animals.

15. Two Types of Fermentation
Alcoholic fermentation occurs in some plant cells and other microorganisms such as yeast. In this process the H bonds with pyruvic acid to produce ethyl alcohol and carbon dioxide. The CO2 is produced as the pyruvic acid is changed to alcohol.