Mam Phys Flashcards
Total body qater is less in
Females and obesity
Total body water
60% of the body weight
42L
A stable balance in the ecf
Input=output
Positive balance
Input exceeds output
Neg balance
Output exceeds input
Compensatory adjustments
Occur on the output side by urinary excretion
-to keep salts and acids within narrow homeostatic ranges
ICF compartment
One compartment
-67% of tbw (28L)
Ions in ICF
Low na, cl, ca
High k, mg, po4, protein
ECF compartment
- 33% of TBW (14L)
- ISF+plasma
ISF compartment
- 80% ECF (11.2L)
- between cells
- low protein
Plasma
- 20% of ECF
- clear fluid
- noncellular
- electrolytes
Ions in the plasma
High na, cl
Moderate hco3-
Low k, mg, ca, po4
Hematocrit
Packed rbc
- 42 males
- 38 females
0.5 polycythemi
Minor ecf compartment includes
Transcellular fluid and lymph
Barrier between plasma and isf
Blood vessel walls
Barrier between the ecf and icf
Selectively permeable plasma membrane
The ecf is an intermediary between
Cells and the external env
By regulating the plasma, ___ is also regulated
The volume of the isf
Regulation of __ and __ are closely related
Ecf volume and osmolarity
Regulation of ECF volume
Helps maintain blood pressure
Shortterm control of bp
Baroreceptor reflex
Temporary/automatic shifts between the plasma and ISF
Longterm regulation of bp
Control of urine output and thirst
Regulation of ECF osmolarity is important for
Maintaining constant cell volume
Salt
Has water holding power
Less salt in the ECF means loss of water
