Cell Respiration

Chemosynthesis Autotrophs get E from inorganic compounds instead of light

Chemosynthesis

Cell Respiration Food is broken down to release E Essential to Life Not breathing!

Cell Respiration C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + E

Mitochondria Where cell resp’n takes place Powerhouse of cell

Aerobic Respirat’n Requires O (O= Oxygen)

Anaerobic Respirat’n Doesn’t require O Hardcore exercise

Cell Respiration THREE PHASES: 1.Glycolysis 2.Krebs Cycle 3.Electron Transport Chain (ETC)

Glycolysis Splits Glucose Occurs in cytoplasm With or without O Yields: 2 ATP

After Glycolysis If no O is present  fermentation begins If O is present  Krebs Cycle begins

Krebs Cycle Hans Kreb, British biochemist in 1937 Pyruvic Acid broken down into CO 2

Krebs Cycle Occurs in mitochondria Yields 2 ATP CO 2 is exhaled

ETC High E electrons convert ADP to ATP Matrix of mitochondria Yields 32 ATP *Most ATP

After Glycolysis If no O is present  fermentation begins If O is present  Krebs Cycle begins

Fermentation No O 2 present Two types:

Lactic Acid Ferm’tn lactic acid is product Ex. Muscles & muscle fatigue

Alcoholic Ferm’tn Makes Ethyl alcohol & CO 2 Alcohol in beverages CO2 in breads

Totals Review Glycolysis yields 2 ATP Krebs yields 2 ATP, ETC yields 32. For a total of 36. Final wastes are water & carbon dioxide. Body uses 38% of the energy. 62% is released as heat.

Cell Respiration Glucose (C 6 H ) + Oxygen (0 2 ) Glycolysis Krebs Cycle Electron Transport Chain Carbon Dioxide (CO 2 ) + Water (H 2 O)