Animal respiration
• Energy (ATP) - From Cellular respiration or biological oxidation
• Cellular respiration - Intracellular oxidation of nutrients & fuel
release their energy for biological functions
Anaerobic respiration (fermentation)
• Partial oxidation of fuel molecules in the absence of molecular oxyg
• Releases small portion of energy (2 ATP molecules per glucose mol
• In the case of glucose - 20-30% energy release; rest as heat
• Common among yeasts, some bacteria (lactic acid bacterium, tetan
,• Yeast derive energy - Fermentation of glucose to ethyl alcoh
fermentation)
• Fermentation of glucose & lactose (C12H22O11) to lactic acid
fermentation) - In some Bacteria, endoparasites & skeletal muscles
• C6H12O6——Alcoholic fermentation ————2C2H5OH (ethyl alcohol)+ 2
• C6H12O6—Lactic acid fermentation ———2C3H6O3 + energy
• C6H12O6 + 6O2—Aerobic respiration ——— 6CO2 +6H2O + energy
, Aerobic respiration
• Complete cellular oxidation of organic molecules utilising molecu
releasing CO2
• Liberates entire energy from fuel molecules (About 38 ATP m
glucose molecule)
• Centre - Mitochondria (Eukaryotes), PM & cytoplasm (Prokaryotes
• In some animals - Lactic acid fermentation occurs in skeletal muscl
, • Aerobic respiration -
• (a) External / organismic respiration - Exchange of gase
between organism & external medium
• (b) Internal respiration/ cellular respiration (Tissue respirat
uptake of O2 & oxidation of fuel molecules release CO
energy
• In higher animals,
• External respiration - (i) Gas exchange (ii) Gas transport
• Energy (ATP) - From Cellular respiration or biological oxidation
• Cellular respiration - Intracellular oxidation of nutrients & fuel
release their energy for biological functions
Anaerobic respiration (fermentation)
• Partial oxidation of fuel molecules in the absence of molecular oxyg
• Releases small portion of energy (2 ATP molecules per glucose mol
• In the case of glucose - 20-30% energy release; rest as heat
• Common among yeasts, some bacteria (lactic acid bacterium, tetan
,• Yeast derive energy - Fermentation of glucose to ethyl alcoh
fermentation)
• Fermentation of glucose & lactose (C12H22O11) to lactic acid
fermentation) - In some Bacteria, endoparasites & skeletal muscles
• C6H12O6——Alcoholic fermentation ————2C2H5OH (ethyl alcohol)+ 2
• C6H12O6—Lactic acid fermentation ———2C3H6O3 + energy
• C6H12O6 + 6O2—Aerobic respiration ——— 6CO2 +6H2O + energy
, Aerobic respiration
• Complete cellular oxidation of organic molecules utilising molecu
releasing CO2
• Liberates entire energy from fuel molecules (About 38 ATP m
glucose molecule)
• Centre - Mitochondria (Eukaryotes), PM & cytoplasm (Prokaryotes
• In some animals - Lactic acid fermentation occurs in skeletal muscl
, • Aerobic respiration -
• (a) External / organismic respiration - Exchange of gase
between organism & external medium
• (b) Internal respiration/ cellular respiration (Tissue respirat
uptake of O2 & oxidation of fuel molecules release CO
energy
• In higher animals,
• External respiration - (i) Gas exchange (ii) Gas transport
