Thursday, November 29, 2007


Regulating the Internal Environment

Conforemers vs. Regulators
There are two evolutionary paths for organisms, they can either regulate their internal enviornment or conform to their external environment. When organisms regulate thier internal enviornment they are able to maintain a relatively constant internal condition, when they conform they allow their internal conditions to fluctuate along with
any external changes.

Water Balance and Nitrogenous Waster Removal
As there was a change from unicellular to mutlicellular organisms the syestems within animal had to evolve in order to support all multicellular life.One can see this through the respitory system, digestive system and circulatroy system all working together. Through entry ways foods and other materials are entered into the body but at the same time both extra cellular waste and intrecellular waste are being removed. Another example is systems built inside larger cells. Becasue the cells have divided and therefor created a larger surface area the cells inside are not exposed to water and there for are not able to diffuse items into them, but becasue
these cells have systems that creates entry ways into them they are able to gain materials no matter what their location maybe.

Solving Exchange Problems
In order to over come the limitations of diffusion certain systems much have evolved.Exchange systemes are of use in distributing nutrients by the circulatory system and removing of wastes through the excrectory system.

We were also introduced to the beginnings of osmoregulation or the balancing of water.Osomoregulation is determined by where you live and the amount of water in your surronding areas.Organims found in fresh water will regulate their water systems differently then let say those found on land due to the amount and the type of water that is availible to them.

pardon the lack of pictures, but the system doesn't seem to be working in my favor today
and our next report will be delivered by Alex.
Enjoy! =)

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