Download Cellular Respiration

Cellular Respiration
Cellular Respiration
 The process that releases energy by breaking down glucose
and other food molecules in the presence of oxygen.
 Purpose is to produce energy!
Stages of Aerobic Respiration
 Aerobic: OXYGEN IS PRESENT
1. Glycolysis: the process in which one molecule of glucose is
broken in half, producing two molecules of pyruvic acid, a 3carbon compound.
2. Kreb’s Cycle/Citric Acid Cycle: pyruvic acid is broken
down into carbon dioxide in a series of energy-extracting
reactions.
3. Electron Transport Chain: uses the high energy
electrons of the Kreb’s Cycle to convert ADP to ATP.
 Produces the most ATP (energy) of any stage!
Chemical Equation
 Copy in notes!
Stages of Anaerobic Respiration
 Anaerobic: NO OXYGEN IS PRESENT
 After glycolysis, goes to fermentation.
Fermentation
 Releases energy from food molecules by producing ATP in
the absence of oxygen.
 Alcoholic fermentation: used by yeasts and other
microorganisms forming ethyl alcohol and carbon dioxide.
 Used to produce alcoholic beverages.
 The CO2 released causes bread dough to rise.
 Lactic Acid fermentation: regenerates NAD+ so that
glycolysis can continue.
 Produced in muscles during rapid exercise when body is lacking
oxygen
 Cause of muscle soreness.
Comparing/Contrasting Anaerobic and
Aerobic Respiration
Aerobic
Anaerobic
Requires oxygen
Does NOT require oxygen
Generates many ATP
Leads to the Kreb’s cycle after
glycolysis
Generates few ATP
Leads to fermentation after
glycolysis
Energy Totals
 Both plants and animals carry out the final stages of cellular respiration in the
mitochondria.
 Copy the flow chart below.
 Notice that 36 ATP are produced!!!
Comparing/Contrasting Photosynthesis
and Cellular Respiration
Photosynthesis
Respiration
Occurs in plants
Occurs in plants and animals
Takes place in the chloroplast
Takes place in the mitochondria
Reactants: sunlight, water, carbon
dioxide
Reactants: oxygen and glucose (sugar)
Products: oxygen and glucose (sugar)
Products: water and carbon dioxide
Reverse Reactions
Reverse Reactions
Generates a few ATP
Generates several ATP
Purpose: to make sugar
Purpose: to convert food to energy
6H2O + 6CO2 + light  C6H12O6 +
6O2
C6H12O6+ 6O26H2O +6CO2