1. Objective
SWBAT explain cellular respiration and compare it to photosynthesis.

2. Cellular Respiration

3. Cellular Respiration It’s all about Energy!!
Cellular Respiration is the process of converting food energy to energy in the form of ATP
Oxygen + Glucose  Carbon Dioxide + Water + Energy
6O2 + C6H12O6  6CO2 + 6H2O + 36ATP

4. How is Cellular Respiration related to Photosynthesis?
Photosynthesis and cellular respiration are opposite reactions
Photosynthesis:
light energy
Carbon dioxide + water Glucose + oxygen
Cellular respiration:
Glucose + oxygen Carbon dioxide + water
ATP

5. How is Cellular Respiration related to Photosynthesis?
The reactants of one reaction are the products for the other
The sun’s energy is converted to ATP (chemical energy) for use in the cell

6. Why do we need cellular respiration?
To make ATP!

7. How is ATP used? ATP powers all the work of the cells
Synthesizes molecules for growth and reproduction
Transport work – active transport, endocytosis, and exocytosis
Mechanical work – muscle contraction, cilia and flagella movement, organelle movement

8. Why use ATP energy and not energy from glucose?
Breaking down glucose yields a lot of energy and most of the energy would be wasted as heat.
So instead glucose is broken down in a series of small steps that yield smaller packages of usable ATP

9. Where does cellular respiration occur?
Occurs in the mitochondria
How does the structure of the mitochondria contribute to cellular respiration?
Folded inner membrane means greater surface area for making ATP

10. Why do we breathe?
You cannot say that we breathe in order to live. That is no longer acceptable.
We breathe to get oxygen so our cells can make ATP.

11. Totals
Cellular respiration produces 36 ATP for every 1 molecule of glucose

12. What happens if you aren’t getting enough oxygen to your cells?
Fermentation = making ATP without using oxygen
Anaerobic process (no oxygen)
Occurs during intense exercise
Does not make as much ATP as cellular respiration – only 2 ATP (not efficient)

13. Why do your muscles hurt after exercise?
Fermentation makes lactic acid
Lactic acid build up is what causes your muscles to be sore