The respiratory quotient depends upon:a)Respiratory productsb)respiratory substratesc)ATPd)NADHCorrect answer is option 'B'. Can you explain this answer?

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Answer

Answer

Answer

The respiratory quotient depends upon the type of respiratory substrate used during respiration. When Carbohydrate is used as subtract and are completely oxidized ,the RQ will be 1,because equal amounts of CO2 and O2 are involved and consumed respectively. When fats are used in respiration, the RQ will be less than 1

Answer

Respiratory quotient, actually deals with the amount of OXYGEN used in order to oxidize or break the consumed food. This results in the evolution of CO2.
R.Q. = CO2 evolved/ O2 used.

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The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called as the respiratory quotient (RQ) or respiratory ratio.
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1.

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Respiratory quotient depends on type of substrates we used.the values of respiratory quotient differ from one substrate to another . bcoz different substrates used different amount of O2 for breakdown

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The respiratory quotient (RQ) is a measure of the ratio of carbon dioxide (CO2) produced to oxygen (O2) consumed during cellular respiration. It provides information about the type of fuel being used by the cells for energy production. The RQ can vary depending on the respiratory substrates being utilized by the cells.

b) Respiratory substrates:

The respiratory substrates refer to the molecules that are oxidized during cellular respiration to produce ATP, the energy currency of the cell. These substrates can be carbohydrates, fats, or proteins. The RQ value changes depending on the type of substrate being oxidized.

1. Carbohydrates:
When glucose, a common carbohydrate, is used as the respiratory substrate, it undergoes glycolysis and enters the Krebs cycle to produce ATP. The complete oxidation of glucose yields carbon dioxide and water. The balanced equation for glucose oxidation is:

C6H12O6 + 6O2 → 6CO2 + 6H2O

In this case, for every molecule of glucose oxidized, six molecules of CO2 are produced. The RQ value for glucose oxidation is therefore 1.0.

2. Fats:
Fats are another important respiratory substrate. They are broken down into glycerol and fatty acids. Glycerol can enter the glycolysis pathway and yield pyruvate, which can further enter the Krebs cycle. Fatty acids, on the other hand, undergo beta-oxidation to produce acetyl-CoA, which also enters the Krebs cycle. The complete oxidation of fatty acids yields more carbon dioxide compared to glucose metabolism. The RQ value for fat oxidation is typically around 0.7-0.9, depending on the fatty acid composition.

3. Proteins:
Proteins can also serve as respiratory substrates, although they are not the preferred source of energy. During protein metabolism, amino acids are broken down and converted into various intermediates of the Krebs cycle. The RQ value for protein oxidation varies depending on the types of amino acids being utilized.

In summary, the respiratory quotient depends on the respiratory substrates being utilized by the cells. Carbohydrates have an RQ of 1.0, fats have an RQ of around 0.7-0.9, and proteins have varying RQ values depending on the amino acid composition. Therefore, the correct answer is option 'b' - respiratory substrates.

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