第五期有奖听力练习(1个威望)

sddz

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叮叮糖

[hide= Cells and temperature

Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C;a departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fluctuations the integrated actions of bodily systems are impaired. Other animals have a wider tolerance for changes of bodily temperature.

For centuries it has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of characterizing the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division into "warm-blooded" and "cold-blooded" species.

warm-blooded included mammals and birds whereas all other creatures were considered cold- blooded. As more species were studied, it became evident that this classification was inadequate. A fence lizard or a desert iguana,each cold-blooded----usually has a body temperature only a degree or two below that of humans and so is not cold. Therefore the next distinction was made between animals that maintain a constant body temperature, called hometherms, and those whose body temperature varies with their environments, called poikilotherms. But this classification also proved inadequate, because among mammals there are many that vary their body temperatures during hibernation. Furthermore, many invertebrates that live in the depth of the ocean never experience changes in the chill in the deep water and their body temperature main constant.[/hide]

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haiyanchia

[hide=5000Seals and Temperature

Seals can not remain a live outlet certain limits of temperature and much narrow limits mark the boundaries effective functioning and their systems of animals and birds are most efficient only within a narrow range around 37 0C. The departure for the few degrees from those values serious empires their functioning. Even though seals can survive wider frustrations, the integrate actions of bodily systems are expired. Although animals have a wide holirins or changes its bodily temperature
For centuries, it had been recognized that animals and birds differ from other animals in the way irregular body temperature. Ways of characterizing the difference had become more accurate and meaningful all the time. But popular terminology still reflects the old division into warm-blooded and cold-blooded species. Warm-blooded included animals and birds whereas all other creatures were considered cold-blooded. As more species were studied, it became evident that this classification was inadequate. A fanslizard or deserd iguona each cold blooded usually has a body temperature only a degree or two below that of human’s man show it’s not cold. Therefore, the next distinction was made between animals that maintain a constant body temperature called homoiotherms and those whose body temperature varies called poicilutherms. But this classification also proved inadequate because among animals there are many that vary their body temperatures during habitation. Furthermore, many invadibus that lives in the depth of the ocean never experience changes in the trail of the dig water and their body temperature remain constant[/hide]

ng_hei

[hide=50000
Cells and Temperature
    Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37 C. A departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fluctuations the integrated actions of bodily systems are impaired. Other animals have a wider tolerance for changes of bodily temperature.
    For centuries it has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of characterizing the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division into warm-blooded and cold-blooded species. Warm-blooded included mammals and birds whereas all other creatures were considered cold-blooded.
    As more species were studied, it became evident that this classification was inadequate. A fence lizard or a desert iguana, each cold-blooded, usually has a body temperature only a degree or two below that of humans and so is not cold. Therefore the next distinction was made between animals that maintain a constant body temperature, called homoiotherms, and those whose body temperature varies with their environments, called poikilotherms. But this classification also proved inadequate, because among mammals there are many that vary their body temperatures during hibernation. Furthermore, many invertebrates that live in the depths of the ocean never experience change in the depths of the ocean never experience change in the chill of the deep water, and their body temperatures remain constant.
[/hide]

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