PHGY 216 Final Exam Notes|| Questions and Verified Answers

PHGY 216 Final Exam Notes|| Questions and Verified Answers 1. body bluid- two major compartments.: Intracellular Fluid (I C F) -This is the fluid within cells and comprises about two thirds of total body fluid -Extracellular Fluid (E C F) -fluid surrounding the cells which includes the plasma, the interstitial fluid, lymph, and transcellular fluid -comprises about one third of total body fluid -plasma is about one fifth of the E C F, the interstitial fluid is about four fifths of the E C F, and the lymph and the transcellular fluid are considered negligible. 2. -BARRIERS BETWEEN BODY-FLUID COMPARTMENTS: -Barriers between the plasma and the interstitial fluid -separated by the blood vessel walls. -everything in the plasma (except proteins) can freely exchange with the interstitial fluid through capillaries -thus, the composition of the plasma and the interstitial fluid are identical, except plasma proteins -Barriers between the intracellular fluid and the E C F -barrier is the plasma membrane that surrounds each cell in the body -I C F contains proteins that do not exchange with the E C F -unequal distribution of ions across this barrier (i.e. K+ in ICF, Na+ greater in ECF) 3. -2 main factors to regulate fluid balance: -ECF determines exchange of substance into the ICF -overall control of fluid balance is dependent upon regulating the E C F. -E C F Volume -closely regulated to maintain blood pressure