10.3 Anaerobic Respiration (Cambridge (CIE) O Level Biology): Flashcards
Exam code: 5090
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Define anaerobic respiration.
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Define anaerobic respiration.
The chemical reactions in cells that break down nutrient molecules to release energy without using oxygen.
What is the only product of anaerobic respiration in animal muscle cells?
Lactic acid.
Carbon dioxide is not produced by anaerobic respiration in animals.
What is the word equation for anaerobic respiration in animals?
glucose → lactic acid
Energy is also released.
What is the word equation for anaerobic respiration in yeast?
glucose → ethanol + carbon dioxide
Energy is also released.
Anaerobic respiration is the breakdown of glucose and releases only a small amount of energy.
Anaerobic respiration is the incomplete breakdown of glucose and releases only a small amount of energy.
True or False?
Anaerobic respiration releases more energy than aerobic respiration.
False.
Anaerobic respiration releases less energy because glucose is only broken down incompletely.
How is anaerobic respiration in yeast used in bread making and brewing?
In bread making, the carbon dioxide produced makes the dough rise.
In brewing, the ethanol makes the drink alcoholic and the carbon dioxide gives it fizz.
True or False?
Carbon dioxide is a product of anaerobic respiration in animals.
False.
The only product is lactic acid; carbon dioxide is produced in aerobic respiration.
Why must lactic acid be removed from muscle cells?
It lowers the pH of the cells, which could denature the enzymes inside them.
Lactic acid is carried in the blood to the , where it is oxidised into carbon dioxide and water.
Lactic acid is carried in the blood to the liver, where it is oxidised into carbon dioxide and water.
Define oxygen debt.
The extra oxygen the body must take in after vigorous exercise to oxidise the lactic acid that has built up.
Why do we continue to breathe heavily and keep a high heart rate after vigorous exercise?
To take in and transport extra oxygen to the liver to oxidise the lactic acid.
This is known as repaying the oxygen debt.
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