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Neurophysiology - Neuroanatomy
Preparation for Test One
17
Anatomy
Graduate
01/26/2016

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Cards

Term
Resting membrane potential
Local potentials
Action potentials
Definition
What are the three different types of electrical potentials in the neural system?
Term
Concentration gradient
Electrical gradient
Definition
What two forces acting on each type of ion determine the distribution of each ion?
Term
Gibbs-Donnan effect
Definition
The behavior of charged particles (proteins and AA) near a surface of a semipermeable membrane to sometimes fail to distribute evenly across the two sides of the membrane (such as a plasma membrane)
Term
The presence of a different charged substance that is unable to pass through the membrane and thus creates an uneven electrical charge
Definition
What causes the gibbs-donnan effect?
Term
Negatively charged ions trapped inside the neuron (proteins; Gibbs – Donnan).
Active transport of 3Na+ (out) and 2K+ (in).
Passive diffusion of Na+, K+ and Cl- through non-gated ion channels
Definition
What is the resting membrane potential, 70 mV, maintained by?
Term
Na+ and Cl-
Definition
What concentrations are higher on the outside of the cell?
Term
K+ and organic anions (PO4--- )
Definition
What concentrations are high on the inside of the cell?
Term
V=IR
V - Membrane Voltage
I - Current for an Ion
R - Resistance
Definition
Ohm's Law (and meaning)
Term
I=(V - E) X g
I - Current of ion
V - Membrane voltage
E - Electromotive force of an ion
g - Conductance (inverse of resistance)
Definition
Alternate ohm's law (and meaning)
Term
True
Definition
The Vm will be closes to the ion with the best conductance? True/False
Term
Potassium (80% of membrane conductance attributed to K)
Definition
What ion has the best conductance in a normal cell?
Term
E=RT/zf ln [ion]o/[ion]I
Definition
Nernst Equation
Term
V=IR
V - Membrane Voltage
I - Current for an Ion
R - Resistance
Definition
Ohm's Law (and meaning)
Term
I=(V - E) X g
I - Current of ion
V - Membrane voltage
E - Electromotive force of an ion
g - Conductance (inverse of resistance)
Definition
Alternate ohm's law (and meaning)
Term
True
Definition
The Vm will be closes to the ion with the best conductance? True/False
Term
Potassium (80% of membrane conductance attributed to K)
Definition
What ion has the best conductance in a normal cell?
Term
E=RT/zf ln [ion]o/[ion]I
Definition
Nernst Equation
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