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Cellular Respiration

Overview of cellular respiration. Featuring aerobic respiration, alcohol fermentation, and lactic acid fermentation.
by

Marlo Taylor

on 8 November 2012

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Transcript of Cellular Respiration

Anaerobic Respiration (fermentation) Aerobic Respiration Aerobic Respiration Cellular Respiration Aerobic Respiration Alcohol Fermentation Lactic Acid Fermentation
Oxygen
Glucose
Electron acceptors: chemicals that will accept electrons from other compounds. Formula: Overall equation for what happens during cell respiration. Overall Glycolysis- "sugar splitting” The FIRST step of respiration Overview:
Occurs in the cell cytoplasm
Uses the products from photosynthesis
Needs energy in the form of ATP to occur – 2 ATP’s used, but produces 4 ATP’s and other energy compounds
Does NOT require oxygen Overall Krebs Cycle (citric acid cycle) The SECOND step of respiration Overview:
Needs oxygen
Occurs in the matrix of the mitochondrion
No true final product; just a continuing cycle Overall (glucose) Electron Transport Chain (ETC) The THIRD step of respiration Overview:
Occurs in the inner membrane of the mitochondrion
Electrons passed from electron accepting compounds to oxygen atoms, which join hydrogen ions to make water
32 ATP’s made in the process ETC Overall Aerobic Respiration Summary Net ATP gain from respiration: 36 ATP Occurs in the absence of oxygen!
Only in cytoplasm – not in the mitochondrion
Net energy gain = 2 ATP
Very inefficient!!
Two important types of fermentation Fermentation Alcohol Fermentation Lactic Acid Fermentation Occurs in yeast and some bacteria
Human uses:
A. Brewer’s yeast – beer, wine (alcohol)
B. Baker’s yeast – CO2 causes dough to
rise – the alcohol evaporates Occurs in muscle cells
Only 5% efficiency, but provides rapid energy for 2-3 minutes
Results in muscle fatigue and pain Requirements: 2 Pyruvic Acids
Full transcript