Thursday, February 7, 2008

Activity 3.2 Question

How do organisms respond to varying environmental conditions (i.e. temperature)?


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7 comments:

Christopher Noda said...

There are two types of organisms in this world. Homeotherms and poikilotherms. (warm and cold blooded.)Each functions differently and need to adapt to their environment in order to live there. Homeotherms are the same body temperature and never change unless sick. Even if out in the cold they will try to maintain there internal body temperature. They do not have to adapt to the temperature around them. Poikilotherms on the other hand are the opposites. Their blood temperature is never the same and they must adapt and adjust to the outside body temperature. For example. A rattlesnake is hot and would like to cool down. It would move to the shade and eventually its internal body temperature would cool down. Say it gets too cold in the shade and wants to warm up. It might choose to bask on a rock in order to heat up its body temperature. All in all organisms respond to different temperatures by either increasing their metabolism or by moving to a different environment.

Jackie Schechter said...

Diffrent orginisms respond diffrently to varing temoerture changes. Poikilotherm is andother name for cold blooded animals, and Homeotherm is another name for watm blodded animals.Poikilotherms are not very active when externial tempertures are too low, but Homeotherms are stay active in many extrime temperatures. Homeotherms maintain a constant body temperature while Poikilotherms change their body temperature acording to it's external temperature.

Jametria Wright said...

Organisms respond differently to environmental conditions. Homeotherms maintain fairly constant body temperatures despite the changes in environmental temperatures. They're body temperatures remain substantially higher than the temperature surrounding them, which means that they can usually remain active through a wide range of external temperatures. Some animals that are classified as homeotherms are birds and mammals. Poikilotherms maintain higher internal temperatures than some warm-blooded animals, and it changes with the surrounding environment. Most poikilotherms are less active when the surrounding temperatures are low and become more active as the temperature increases. The primarily act in behavioral responses when the external temperature changes. Animals that are listed as poikilotherms are reptiles and fish.

Suzie said...

All organisms have optimum conditions they must live in(including what temperature they can tolerate). Most organisms can only tolerate a narrow range of temperatures, meaning that these organisms must either live in a moderate climate, or adapt to many different temperatures by developing mechanisms to help them maintain their optimum temperature. Poikilotherms (cold-blooded animals) and homeotherms (warm-blooded animals) are examples of adaptations some organisms have made to maintain their internal temperature. Poikilotherms' body temperatures depend on the temperature of the environment (their body temperature changes when the climate of the environment changes). If the organism wants to cool down, they move to a cooler area of temperature (shade) and if they want to heat up, they move to a higher area of temperature (sunny). Homeotherms' body temperature is stable and does not change depending on the environment. To heat up, the organism's body tries to keep in heat by reducing the heat flow to the environment. To cool down, the organism increases the flow of heat from its body to the environment.

Christine Jackson said...

The easiest way to explain is by saying that different organisms respond to different temperatures (climates) differently. This is because both types of organisms (pokilotherms and homeotherms) both have their own ways of adapting to temperatures. For example, when warm, a pokilotherm's metabolism rises and they become more active, wheras a homeotherm's metabolism increases. And when the temperature droppes, a pokilotherm's metabolism slows so as to conserve body temperature lost to the environment and they become less active. But a Homeotherm's metabolism will increase so as to warm the internal temperature and will remain active throughout a wide variety of temperatures. But if the temperaute gets too low, then both the homeo and pokilotherms will suffer consequensis. For example, if too cold, an organism's cells will freeze, causing irreparible damage. And if the temperatures become too high, then the proteins of an organisms will become insoulable, a change that is irreversable. That is how different organisms respond to different temperatures differently.

Lucy Lloyd said...

There are two types of organisms: poikilotherms and homeotherms. These two types react very differently to different weather conditions. Unlike poikilotherms, homeotherms maintain a consistent body temperature. They can do this by using perspiration (sweating), or decreasing the metabolism and increasing blood flow to the skin when it is hot outside. Or if it is too cold, the hairs on their body become erect to create insulation, the metabolism increases to create more heat and energy for the body to thrive on, and the blood flow to the skin decreases so not so much heat is let off the the air. However, to do all of these things, homeotherms need up to 10x more energy than poikilotherms, meaning they eat more. Poikilotherms cannot maintain a consistent body temperature all on their own. In order to do that, they must change their external temperature. For example, to prevent from overheating, poikilotherms would need to find shade or a cooler area in order to cool off. If they get too cold, they need to move into a sunny spot and absorb more radiant energy. This may be easier though, since they don't completely control their internal body temperature, they do not have to eat as much because they do not need the energy to make their bodies change temperatures.

shruza said...

All organisms have an optimal temperature range at which the organism functions that best. Animals are either poikilotherms or homeotherms. Poikilotherms are animals like snakes and fish whose internal body temperature changes or varies depending on the temperature of the environment. Homeotherms are animals like mammals and birds whose body temperature remains relatively the same regardless of the temperature of their surroundings.
In hotter temperatures, most poikilotherms are more active than when it is colder. This is because when it is warmer the metabolism of most organisms increase so they need more food and are more active and when it is colder, organisms’ metabolisms decrease so they require less food and are less active. When it is hot, poikilotherms will stay in the shad until their internal body temperature reaches their optimal temperature and when it is cold, poikilotherms stay in the sun or find a warmer place to stay until their body temperature increases. Poikilotherms must rely on their environment to stay warm or cool enough to survive because their body temperature changes in response to their surroundings.
Homeotherms’ body temperatures, unlike poikilotherms’ body temperatures, are not as affected by the external temperatures. If a homeotherm’s body temperature rises above the optimal temperature, about 37 degrees Celsius for humans, metabolism decreases so less heat is produced, perspiration transfers heat out of the body and blood flows to the skin to increase heat loss. If a homeotherm’s body temperature becomes too low, metabolism increases so more heat is produced, hair stand up strait to provide insulation and blood flow to the skin is lessened to prevent heat loss.