part of action potential and neuron

cell membrane

protects the cell

nucleus

controls the entire neuron - DNA

Axon

transfers signals to other cells and organs

Myelin Sheath

increases the speed of the signal

Axon terminal

forms junctions with other cells

Schwann cell

produces the myelin sheath. 1. speed up impulse. 2. insulate the action

Node of Ranvier

allow diffusion of ions

Axon hillock

generates impulse in the neuron

cell body

organizes and keeps the cell function

Dendrites

receive signals from other cells

nerve impulse travel

dendrites, cell body, axon, axon terminals

resting potential

neuron not stimulated: about -70 mV

sodium pump

2 k+ ions in, 3 Na+ ions out. creates different concentration

depolarization

sodium rushes into neuron. inside less negative than positive

Repolarization

K+ moves out of neuron. inside negative again

hyperpolarization

neuron more negative than resting potential

Refractory period

recovery time. everything needs to return to resting state.

action potential

Resting, Threshold, Depolarization, Peak, Repolarization, Hyperpolarization, refractor period, resting