14 terms

Nervous system-Workbook terms p. 134-136

Action potential
Impulses travelling down a nerve cell axon.
Inside a cell.
Refractory period
Period of repolarization during which the neuron cannot respond to a second stimulus. Period of time when all of the K+ are outside the cell and have not yet been pumped back in.
Located between cells.
Membrane potential becomes LESS NEGATIVE.
The stage of impulse transmission when K+ flow out of the cell. The period of change from +55mV to -75mV.
The beginning of this stage of impulse transmission is when the Na+ gates open. This phase of impulse transmission involves a large increase in membrane potential resulting in a sudden change from -70mV to +55mV.
The name of the signal that starts an action potential.
These ions cannot move across the membrane unless their gate is open. When they move into the cell, the potential becomes positive.
The state of having a greater charge on one side than the other of a membrane.
Resting membrane potential
The normal potential of the inside of a nerve cell. When the cell's potential is at -70mV.
These ions can move across the membrane even if their gate is closed. When their gates open, they rush out of the cell.
Sodium-Potassium pump
This is the machinary that re-establishes resting membrane potential, helping the nerve cell return to normal after an impulse. This pumps sodium and potassium ions across a membrane.
Glial cells
These act as a support system for neurons. Cell in the nervous system that is supportive and connective in function.