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32 terms

SGU Physiology - Celluar

full terms list here: https://spreadsheets.google.com/ccc?key=0AjAAj6FHNLqGdEVBYWRFbE45bEd6X0p4Q19MQzZ2V1E&hl=en
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Resting Membrane Potential
-90 mV in skel mm, -65 mV in neurons, -40 mV in photoRs (rel high Na+ chans open) and -85 mV in cardiac mm
Na+ equi potential
equi pot: (+)60 mV (slightly higher in mm vs neurons)
K+ equi potential
(-)83mV (lower in skel mm) => > perm => much greater influence on resting memb pot than Na+
tonic control
constantly controlling a var toward the set point, oft referred to ANS SNS/PSNS stim
hiearchy
some feedback loops more important than others
redundancy
multiple homeostatic mechanisms controllling an important parameter
extracellular [Na+]
142 mM
extracellular [K+]
4.4mM
extracellular [Cl-]
102mM
extracellular [protein]
1mM
extracellular osmolarity
290mOsm
intracellular [Na+]
15 mM
intracellular [K+]
120mM
intracellular [Cl-]
20mM
intracellular [protein]
4mM
intracellular osmolarity
290mOsm
diffusion
movement of molecules due to random thermal movement
digoxin
drug for cardiac failure that blocks the Na+/K+ ATPase in cardiac cells => inc [Ca2+]i -> inc contractile F
SGLT
cotransporter of Na+ and Glc
NKCC
Na+/K+/Cl- cotransporter
Dalton's Law
eq: Total Pressure = Sum of Partial Pressures
Henry's Law
eq: []dissolved gas = Ks * Px
Equivalent
Molarity (M) * # of charges
Molarity
[]/liters solvent
Osmolarity
moles of solute particles
Osmolality
Osmolarity/Kg H20
Reflection coefficient
actual/theoretical osmotic pressure
tonicity
how a solution affects cell volume when the cell is placed in to it
excitable cell
any cell that can generate Ap's
depolarisation
phase of Ap that involves opening of volt-gate Na+ chans -> Na+ influx
repolarisation phase
Ap phase involving close of VG-Na+ chans, open VG K+ chans -> K+ efflux
refractory period
Ap phase of around 1ms where neuron can't generate another Ap