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26 Cards in this Set

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Absolute refractory period
the time during the action potential when the cell is unresponsive to stimulus of any intensity
Action potential
an electrical signal produced and propagated by an excitable cell
Antidromic Conduction
movement of an action potential from the axon terminal toward the soma
Depolarize
to become more positive
Electrochemical gradient
the combined effects of theconcentration and charge gradient which will determine the direction of movement of an ion across a semipermeable membrane
Equilibrium potential
the theoretical voltage that would be produced across a plasma membrane if only on ion were able to diffuse through the membrane
Excitable cell
a cell that is capable of producing and propagating an action potential
Graded potential
an electrical signal of variable aplitude which is conducted decrimentally
Hyperkalemia
a concentration of potassium in the blood that exceeds the accepted normal range
Hyperpolarize
to become more negative
Hypokalemia
a concentration of potassium in the blood that falls below the accepted normal range
membrane potential
the potential voltage difference that exists across a plasma membrane
Nernst potential
the electrical potential across a membrane that will exactly prevent the net diffusion of an ion
Normokalemia
a concentration of potassium in the blood within the accepted normal range
Orthodromic conduction
movement of an action potential from the soma toward the axon terminals
Overshoot
reversal of membrane potential polarity
Relative refractory period
the time during the action potential when the cell is responsive to suprathreshold stimuli
Repolarize
to return to resting membrane potential
Resting membrane potential
a cells membrane potential in the absence of any stimuli
Saltatory conduction
the rapid movement of an action potential from one node of Ranvier to another in myelinated axons
Spatial Summation
the net effect of adding two or more postsynaptic potentials generated at different locatios on the nerve cell but produced at the same time
Subthreshold stimulus
any stimulus less than threshold voltage
Suprathreshold stimulus
any stimulus greater than the threshold voltage
Temporal summation
the net effect of adding two or morepostsynaptic potentials generated at the same location but produced at different times
Threshold potential
the membrane potential to which an excitable membrane must be depolarized to inititate an action potential
Threshold stimulus
any stimulus capable fo depolarizing an excitable membrane to its threshold potential