anaerobic respiration Flashcards
what is anaerobic respiration ?
partial breakdown of hexose sugars in oxygen deprived conditions to produce a limited ATP yield
what happens during anaerobic respiration in animals ?
only glycolysis continues
reduced NAD + pyruvate
——->
oxidised NAD + lactate
what happens to the lactate produced in anaerobic respiration ?
transported to the liver in bloodstream
oxidised to pyruvate by lactate dehydrogenase
involves conversion of NAD to reduced NAD
how does lactate affect muscle contraction in mammals ?
acidic so decreased pH
- results in muscle fatigue
what happens during anaerobic respiration in some microorganisms ?
only glycolysis continues
pyruvate is decarboxylated to form ethanal
ethanal is reduced to ethanol using reduced NAD to produce oxidised NAD for further glycolysis
what is the advantage of producing ethanol/ lactate during anaerobic respiration ?
converts reduced NAD back into NAD so glycolysis can continue
what is the disadvantage of producing ethanol during anaerobic respiration ?
dissolves cell membranes so cells dies when conc is above 12 %
compare the ATP yields per molecule of hexose sugar from aerobic and anaerobic respiration
aerobic = 38
anaerobic = 2 from glycolysis
explain the principle behind using a respirometer ?
pressure changes in the boiling tube due to CO2 production or O2 consumption cause a drop of coloured liquid to move
what is the purpose of sodium hydroxide in a respirometer set up to measure the rate of aerobic respiration ?
absorbs CO2 s that there is a net
decrease in pressure as O2 is consumed
how could a student calculate the rate of respiration suing a respirometer ?
volume of O2 produced or CO2 consumed/ time x mass of sample
volume = distance moved by coloured drop x (0.5 x capillary tube diameter)2 x pi
