7.1 the respiratory process in energy production
DESCRIPTION
Biology Form 4Chapter 7 : RespirationTRANSCRIPT
-
CHAPTER 7: RESPIRATION7.1 The respiratory process in energy production
-
Tr.Rez@SB2013*
Tr.Rez@SB2013
-
Respirationthe oxidation of food substances in the mitochondria of cells to release energy
-
TYPES OF RESPIRATION
-
Types of RespirationAerobic respirationAnaerobic respirationCell respirationGaseous exchange
-
Cell respiration= internal respiration / tissues respirationoxidation of glucose molecules to produce energy, CO2 and H2O
-
Gaseous exchange= breathing / external respirationProcess of :transferring O2 from the surrounding medium (air or water) to cells & the elimination of the products of respiration (H2O & CO2) to the surrounding mediumInvolves : Inhalationexhalation
-
Aerobic Respiration
-
Aerobic RespirationTakes place in all living cells of plants, animals & in certain microorganismsProduction of energy in the presence of oxygenTakes place in mitochondriaProduce 2898 kJ energy
-
Anaerobic Respiration
-
Anaerobic respirationBreakdown of glucose to produce energy in the absence of oxygenInefficient because only a small amount of energy is releasedOccurs both in animal cells & plant cells
-
Anaerobic respirationAnaerobic respiration of glucose in animals produces lactic acid & energyEnergy produced : 210 kJ
-
Anaerobic respirationAnaerobic respiration of glucose in plants produces ethanol, carbon dioxide & energyEnergy produced : 210 kJ
-
Vigorous activity* Oxygen consumption exceeds supplyAnaerobic respiration takes place:* Glucose is broken down into lactic acid to produce some energyOxygen debt in muscles* Lactic acid causes muscle fatigue, pain & cramps
Lungs* Deep & rapid breathing to repay oxygen debLiver* 1/6 lactic acid is oxidised to produce energy* Energy converts 5/6 lactic acid back to glucosetMuscles:* Glucose returns to the muscles* Excess glucose is converted to glycogen for storage