Fluid compartment revision Flashcards
1
Q
transcellular fluid
A
relatively isolated fluid out of the cell
controlled composition
not in equilibrium with other extracellular components
2
Q
why is osmolarity the same in cells as outside
A
surface membrane of most cells are permeable to water
so osmosis ensures osmolarity same on outside as in
in kidney - cells not permeable enough so osmotic gradient can exist across some regions fo the membranes
3
Q
neuroglia
A
not excitable cells astrocytes oligodendrocytes microglia ependyma maintain ionic comp of interstitial fluid around neurons and support neuronal metabolism some synthesis myelin
4
Q
how long does an action potential last
A
few ms
5
Q
where is the 0v reference for an AP
A
outside the cell
