Homeostasis Flashcards
How much of body mass is TBW ?
60%
What is the muscle tissue distribution ?
43% water and 76% tissue
What is the muscle tissue distrubution in Adipose ?
10% Water and less than 10% Tissue
What are the three sources of fluid intake ?
Oxidative matabolism, water content in food and drink.
What are the sources that excrete fluid from the body ?
Urine Insensible persperation and feces.
How much does the normal person sweat in a day ?
100ml / day
In the skin and lung 700ml / day
What are the open fluid compartments ?
Lung Kidney GI tract and Skin
What are the fluid Compartments ?
Intracellular Fluid, Extracellular Fluid (Plasma and Interstitial fluid)
What percent of body mass is made up of blood ?
8%
What are the fluid barriers in the body ?
Capillaries and cell membranes.
What are the major cations and anions of the interstital compartment ?
Na is the major cation and Cl is the major anion.
What is the major cation in the ICF ?
K+, Protein Bicarbonate and phosphate are the major anions.
What are the major anions in the ECF ?
Cl and PO4
What are the 5 criteria for a probe that make it useful to measure body fluids ?
- Nontoxic at the concentration you will employ
- Neither synthesized or metabolized
- Disperses evenly in the fluid
- Disperses only in the compartment of interest.
- Does not influence fluid compartment volume
What is the probe to measure plasma volume ?
Evans Blue
How is plasma volume measured.
A certain quantity of Die injected, Q. Blood is drawn and plasma is extracted so the probe concentration can be measured.
What is the formula to measure Plasma Volume ?
PV= Q / (Q/V)
What is blood volume equal to ?
PV / (1- hematocrit)
What is the probe to measure ECF ?
Inulin thiosulfate or Na+