10. Respiration Flashcards
Def. of respiration
The release of energy from food
Equation for respiration
6O2+C6H12O6—–> Energy + 6CO2 +6H2O
Where does respiration happen
Mitochondria
Name the 2 stages of respiration
- Glycolysis
2. Krebs cycle and electron transportation chain
Products of glycolysis (aerobic +anaerobic)
Aerobic: Acetyl Co-Enzyme A or Pyruvic acid
Anaerobic:
In muscles- Lactic acid + energy
In yeast- Ethanol + CO2 + Energy
Describe glycolysis
Glucose (6 carbon compound) splits into two pyruvic acids (3 carbon compound). ATP is made and CO2 is released
If O2 present: PA is broken down into acetyl coenzyme A (2 carbon compound). CO2, electrons, hydrogen ions are released.
If no O2 present: PA broken down into lactic acid (muscles) or ethanol, CO2 (yeast) and energy (both)
Where does glycolysis take place
cytosol of cytoplasm (space with no organelles)
Stage 2 (part 1)
name
where
Aerobic/Anaerobic
Name: Krebs cycle
Where: Lumen of mitochondria
Aerobic
Stage 2 (part 1)
what happens
products
What: Acetyl coenzyme A (2C) enters krebs cycle.
It joins with a 4 carbon compound = 6C
6C becomes 5C - losing a carbon dioxide
5C becomes 4C, losing CO2
Electrons and hydrogens are released and picked up by NAD- to form NADH
Products: CO2 (molecule lost) and NADH is made (carrier)
Stage 2 (part 2)
name
where
Aerobic/Anaerobic
Name: Electron transport chain (ETC)
Where: Cristae of mitochondria
Aerobic
Stage 2 (part 2)
what happens
products
What:
NADH carries e- and H+ to the ETC.
e- enters a carrier system.
At each carrier the e- releases energy to form ATP.
e- then leaves the carrier and joins with a H+ and O2 to form a H2O
Products: H2O (compound) and ATP
What is the cytosol?
part of cytoplasm where there are no organelles
When is the most energy created?
During Electron Transport Chain
