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Mitochondria

Which of the ...

Question

Which of the following cell organelles liberate heat for the maintenance of constant body temperature in birds and mammals?

A

Lysosomes

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B

Ribosomes

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C

Endoplasmic reticulum

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D

Mitochondria

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Solution

The correct option is D Mitochondria
Mitochondria is the site for aerobic respiration. In aerobic respiration, the unstable bonds of glucose are broken down in the presence of oxygen which leads to the formation of energy. The liberated energy in a exothermic reactions is used for maintenance of constant body temperature in birds and animals.

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Q. Birds and mammals being homeothermic (capable of maintaining constant body temperature) have evolved a mechanism to regulate their metabolic rate. An inverse relationship is observed between metabolic rate and body weight from the plot of the rate of oxygen consumption versus body weight of different mammals. On the other hand, there is a direct proportional relationship between metabolic rate and surface area to volume ratio. From the given figure it is evident that more internal heat per gram of body weight is generated by shrew and more heat is lost to the environment than the horse. Thus maintenance of constant body temperature is more difficult for small animals in cold weather. Why do penguin chicks have to huddle together in cold environment?

Q. Birds and mammals being homeothermic (capable of maintaining constant body temperature) have evolved a mechanism to regulate their metabolic rate. An inverse relationship is observed between metabolic rate and body weight from the plot of the rate of oxygen consumption versus body weight of different mammals. On the other hand, there is the directly proportional relationship between metabolic rate and surface area to volume ratio. From the given figure it is evident that more internal heat per gram of body weight is generated by shrew and more heat is lost to the environment than the horse. Thus maintenance of constant body temperature is more difficult for small animals in cold weather.

What would happen if all the vital organs of an animal are kept at approximately the same temperature?

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