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Thermoregulation

The animals t...

Question

The animals that rely on the heat from the environment rather than metabolism to raise their body temperature are called ___

A

Ectothermic

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B

Poikilothermic

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C

Homeothermic

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D

Endothermic

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Solution

The correct option is A Ectothermic
An ectotherm or a poikilotherm is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature. Such animals rely on environmental heat sources, such as sunlight or a heated rock surface.
Whereas an endotherm or a homeotherm are organisms that can regulate their body temperature through metabolic activities.

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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?

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

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