Homeostasis Flashcards
characteristics of intracellular fluid
fluid in cell
67% of all body fluid
high [] of K and proteins compared to extracellular
define colloidal suspension for blood plasma
proteins remain in suspension (doesn’t dissolve) in plasma
characteristics of interstital fluid
nutrients + gases move from capillary > interstital fluid
26.4% of fluid in body
high Na, Cl, Ca++ then in cell
salty bananas
3 Na, 2K
Na and Cl high outside []
K high inside cell
needs ATP- primary active transport
functions of membrane proteins
cell identity marker
cell surface receptor
ion channel
transporters
enzymes
cell-cell adhesion proteins
cell identity marker
acts as ID tab so cell can distinguish itself
immune response and tissues formation
made up of proteins + carbs
cell surface receptor
a
gets extracellular signal + transmits intracellular messages
ex. neurotransmitters + hormones
ion channel
allows specific ions to move across the membrane along ions [] gradient
K Na channels
transporters and types
moves molecules
facilitated diffusion
active transport
secondary active transport
facilitated diffusion
allows passive solutes to move along [] gradient
cross the membrane
-needs help from transport proteins
active transport
moves molecules against [] gradient with ATP
NA/K pump
secondary active transport
uses ion gradient to move molecules
-uses ATP from primary active transport
enzymes
a catalyst that causes processes (signals, transport, breakdown)
pumps
against [] gradient (low [] to high)
need NRG
endocytosis
too big molecules need the membrane to engulf it
-the membrane then is fully around the molecules and detaches to become a vesicle
exocytosis
too big molecule to leave so packages in vesicle, vesicles binds to membrane than releases molecule in interstitial fluid
units of osmosis
osmotically active particles called osmoles
osmolality calculations
=# of osmoles/kg of h2o
=# of osmoles/L of h2o
osmotic pressure
force required to stop movement of h2o
tonicity
ability of a solution to cause the movement of h20 in or out of a cell
hypertonic
high [] solutes outside cell
h2o moves out and shrinks
-reduces swelling
hypotonic
low [] solute outside cell
h2o moves in and grows
-rehydrates cells
isotonic
= [] in and out of cell
no net movement
300 mOsm
extracellular fluid osmolarity
-290 mOsM
Resting membrane potential
the electrical charge difference across the cell membrane when cell is at rest
-70 mV
also called typical value
electrical-chemical Eqm for K and Na
K -90Mv
Na +60mV
