EVERYDAY SCIENCE

SCIENCE

RESPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why does anaerobic respiration occur during hard exercise?
A
There may be insufficient oxygen supplied to the muscle cells
B
Carbon dioxide builds up in the respiring muscle cells
C
Anaerobic respiration releases more energy from glucose than aerobic respiration
D
None of the above
Explanation: 

Detailed explanation-1: -Due to the need for a lot of energy to conduct strenuous exercises like running, cycling, weightlifting, and so on, which results in a temporary oxygen deficit in the muscle cells. In the absence of oxygen, the cell of the organism undergoes anaerobic respiration, which converts glucose in muscle cells to lactic acid.

Detailed explanation-2: -Anaerobic respiration happens in muscles during hard exercise. Glucose is not completely broken down, so less energy is released than during aerobic respiration. There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidised to carbon dioxide and water later.

Detailed explanation-3: -The science behind anaerobics. Oxygen is required for the body to be able to use fat for fuel. Since aerobic exercise uses oxygen to produce energy, it can use both fat and glucose for fuel. Anaerobic exercise, on the other hand, can only use glucose for fuel.

Detailed explanation-4: -Inadequate oxygen drives muscles towards anaerobic respiration. Partial breakdown of glucose leads to lower energy production.

Detailed explanation-5: -Anaerobic respiration only involves glycolysis. This step produces 2 ATPs and does not need any oxygen. The electron transport chain needs oxygen. Since anaerobic respiration only involves glycolysis (which is an anaerobic step itself) it does not need oxygen.

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