Anaerobic Respiration. Flashcards
Why is Anaerobic Respiration used?
β’ During exercise your muscles need to transfer more energy than normal when they contract-
β’ heart and breathing rate increase to provide cells with enough glucose + oxygen for increase in respiration,
β’ but heart rate cannot increase fast enough-
β’ energy starts transferral from chemical store in glucose via anaerobic respiration-
β’ chemical reactions that donβt use oxygen-
allows the body to transfer extra energy for short periods of time.
What is the Word Equation for Anaerobic Respiration?
Glucose -> Lactic Acid.
Why do you normally respire aerobically?
β’ Aerobic respiration produces more ATP molecules per glucose molecule =
β’ has a greater yield than anaerobic respiration.
β’ because the glucose molecule is fully broken down.
β’ Lactic acid produced from anaerobic respiration can cause cramp.
Lactic acid build up in muscle cells = pain & muscles stop contracting.
β’ Known as fatigue.
What is Oxygen Debt?
β’ When you have finished exercising you keep on breathing heavily.
β’ The extra oxygen you inhale reacts with the lactic acid, breaking it down.
β’ The oxygen needed for this process is called the oxygen debt.
Do animals/plants/micro-organisms perform Anaerobic Respiration?
β’ Yes, e.g. when an animal is being chased by a predator, both are likely to respire anaerobically.
β’ Anaerobic respiration also takes place in plants and some microorganisms when no oxygen is available.
β’ For example in the roots of plants in waterlogged soils.
What is Fermentation?
β’ Anaerobic respiration in microorganisms and plant cells produces ethanol and carbon dioxide instead of lactic acid.
β’ This is fermentation.
β’ Fermentation is another example of anaerobic respiration,
β’ as the organism respires without oxygen.
What is the Symbol Equation for Fermentation?
Π‘6H1206 -> 2C2H5OH+ 2C02
What is the Word Equation for Fermentation?
Glucose -> Ethanol + Carbon Dioxide.
