Tag: respiratory quotient-basic

Respiratory quotient (RQ) is defined as the volume of carbon dioxide released to the volume of oxygen absorbed during the process of aerobic respiration. 

Respiratory quotient is defined as the volume of carbon dioxide released to the volume of oxygen consumed during the respiration process. Its value is one for oxidation of carbohydrates and less than one for oxidation of fats and proteins. The value is more than one for oxidation of organic acids.

R.Q stands for respiratory quotient or respiratory ratio. It is the volume of CO$ _2$evolved to the volume of O$ _2$ consumed. It depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as a substrate and are oxidized completely the RQ is 1.  For fats, it is less than 1 and for proteins, it is 0.9.

Respiratory quotient (RQ) is defined as volume of carbon dioxide released to volume of oxygen absorbed during the process of aerobic respiration of a substrate. 

Our food contains three main constituents: carbohydrates, fats and proteins. The amount of energy released when one gram of any of these food elements is burned is known as calorific value. Thus calorific value of food indicates as to how much is the energy value of food which the human body can gain through metabolism. It is usually given in kcal/gm. Fats form the most concentrated source of energy in our diet. 1 gram of fat yields 9.5 kcal of energy which is the highest among the food components. 1 gram of carbohydrates and proteins yield almost similar amount of energy which is equal to 4 kcal. 

Respiratory Quotient (R.Q.) is the ratio of the volume of CO$ _{2}$ released to the volume of O$ _{2}$ consumed in a respiration process. It depends on the nature of the substrate and its capacity of using O$ _{2}$ and releasing CO$ _{2}$. For example, glucose consumes 6 CO$ _{2}$ and releases 6 O$ _{2}$, so its R.Q. is 1.

Respiratory quotient or R.Q. is the ratio of volume of CO$ _2$ produced to volume of O$ _2$ consumed during cellular respiration. It is measured by Ganong's Respirometer. R.Q. for carbohydrates is 1, organic acid is >1 and fats and proteins is <1.

Compensation point is the value of a factor where the rate of photosynthesis is equal to the rate of respiration.  At this point, carbon dioxide released from respiration is equivalent to that which is taken up during photosynthesis. When the light intensity increases, the compensation point is reached. When light intensity is increased beyond the compensation point, the rate of photosynthesis increases proportionally until the point of light saturation is reached. Beyond light saturation point, the rate of photosynthesis is no longer affected by light intensity. Compensation point varies in different species of plants. It even varies in response to changes in temperature and other environmental factors.