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2130-Module Two Summary

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Department
Physiology
Course
Physiology 3120
Professor
Anita Woods
Semester
Fall

Description
Weekly Thoughts 2 MODULE 2 - Body Fluids We looked at the internal environment in module 1 and learnt that it is important to maintain conditions at relatively constant levels. Recall that the internal environment is everything "inside" the body but does not include the cells. The internal environment is the "space" the cells live in. It is extremely important to maintain the chemical composition and fluid environment of this space so the cells can function properly - you don't want to have too much water or too little, you don't want to have too much of one ion and too little of another. Any change in these values will result in a "not-so-ideal" internal environment, which will cause cells to function improperly. Body Fluids The average human is made up of 60% water or 42 liters (for a 70Kg person). This water is found in 3 different compartments in the body - the intracellular compartments (everything inside the cells), the interstitial compartment (everything outside the cells but not in the plasma) and the plasma. Both the plasma and the interstitial compartment can be combined into the extracellular compartment (EVERYTHING outside the cells including plasma). Most of the water (67%) is found inside the cells (the intracellular compartment). The interstitial compartment contains roughly 26% of the total body fluid while plasma contains
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