Unit 2, Anerobic respiration Flashcards
what is anaerobic respiration?
this is respiration that takes place in plant and animal cells in the absence of oxygen.
anaerobic vs aerobic respiration in the breaking down of food particles
anaerobic- partly broken down
aerobic - molecules are broken down fully
where in the cells does anaerobic respiration occur
in the cytosols
what do anaerobic and aerobic respiration have in common
the 1st stage which is glucolysis
explain glucolysis
a single glucose breaks into two pyruvic acid molecules.
in the absence of O2, pyruvic acid is used in fermentation reactions
what do animals break down pyruvic acid into
it gets broken down into lactic acid ( lactic acid fermentation)
what do plants break down pyruvic acid into
its broken down into alcohol and CO2 ( alcohol fermentation )
the formula of lactic acid fermentation
glucose –> lactic acid + energy
C6 H12 O6 —-> C3 H6 O3 + ATP
formula of alcoholic fermentation
glucose –> alcohol + CO2 + energy
C6 H12 O6 –>C2 H5 O H + CO2 + ATP
anaerobic respiration during exercising
happens during vigorous exercise when body needs more O2 than available
explain heart rate and its effect on anaerobic respiration
heart rate will increase during exercise thus, O2 will moves to cells faster.
now that cells need more O2, they respire anaerobically
because glucose is only broken down partly, how does that affect ATP
partly breaking down releases only a little energy. rest of energy is left in lactic acid
what happens if muscles respire anaerobically for a long time
muscle cramps
what happens to lactic acid after exercise
it is carried to the liver where it is oxidised to form CO2 + H2O
what is oxygen debt
when O2 needs to fully oxidise lactic acid.
deep breathes after exercise repays this debt.
