Shortcut Methods

Shortcut Methods and Tricks for Respiration Numericals

  1. Rate of Respiration:
    • The rate of respiration can be estimated using the Michaelis-Menten equation: V0Vmax=SKm+S where V0 is the rate of reaction, Vmax is the maximum rate of reaction, S is the substrate concentration, and Km is the Michaelis-Menten constant.
  2. Respiratory Quotient (RQ):
    • The RQ can be calculated using the formula: RQ=Volume of carbon dioxide producedVolume of oxygen consumed
    • The RQ can also be estimated using the following table:
Substrate RQ
Glucose 1.0
Fats < 1.0
Proteins > 1.0
  1. Caloric Value of Food:
    • The caloric value of food can be estimated using the formula: H=Σ(qP) where H is the caloric value of food, q is the caloric value per gram of food, and P is the weight of the food in grams.
  2. Basal Metabolic Rate (BMR):
    • The BMR can be estimated using the following formula for men: BMR=66.5+(13.8×W)+(5×H)(6.8×A)
    • The BMR can be estimated using the following formula for women: BMR=655+(9.6×W)+(1.8×H)(4.7×A) where W is the weight in kilograms, H is the height in centimeters, and A is the age in years.
  3. Respiratory Efficiency:
    • The respiratory efficiency can be calculated using the formula: η=Energy obtained from glucose metabolismTotal energy available for metabolism×100
    • The respiratory efficiency can also be estimated using the following table:
Substrate Respiratory Efficiency
Glucose 40%
Fats 60%
Proteins 50%