Respiration Flashcards
uses of energy in living organisms
- muscle contraction
- protein synthesis
- cell division
- active transport
- growth
- passage of nerve impulses
- maintenance of a constant body temperature
–respiration involves the action of enzymes in cells
the effect of temperature on respiration in yeast
Carbon dioxide is released. the volume of CO2 released at different temperatures can be measured using the apparatus opposite.
! more aCO2 released when temperature increases, speeding up the reaction
what is aerobic respiration
the chemical reactions in cells that use oxygen to break down nutrient molecules to release energy
formula for aerobic respiration
glucose + oxygen —-> carbon dioxide + water
C6H12O6 + 6O2 —-> 6CO2 +6H2O
what is anaerobic respiration
the chemical reactions in cells that break down nutrient molecules to release energy without using oxygen
– it release much less energy per glucose molecule than aerobic respiration
anaerobic respiration in yeast
glucose —-> alcohol + carbon dioxide
C6H12O6 —> 2C2H5OH + 2CO2
anaerobic respiration in muscles
glucose —> lactic acid
what is lactic acid
lactic acid builds up in muscles and blood during vigorous exercise causing an oxygen debt
how is oxygen debt removed after exercise
- continuation of fast heart rate to transport lactic acid in the blood from the muscles to the liver
- continuation of deeper and faster breathing to supply oxygen for aerobic respiration of lactic acid
- aerobic respiration of lactic acid in the liver