Crash Course #9

That buzz; that nerve impulse is called the ______________________________________.

action potential

___________________ indicate the flow of positively or negatively charged ions across the resistance of your cells' membranes.

currents

When a neuron is stimulated enough, it fires an _____________________ ______________________ that zips down its axon to its neighboring neurons.

electrical potential

What neurons can vary is the ______________________, or the number of pulses.

frequency

In a cell, voltage is called a ___________________________________.

membrane potential

Neurons only have _______________________________ they can send, and ____________________________ strength and speed.

one signal, one uniform

Inside the neuron there are positively charged ______________________________ ions, but also bigger, negatively charged protiens.

potassium

We keep the positively and negatively charged parts of our body separated to build _________________________.

potential

The difference is the neuron's __________________________________________ and is usually around -70 mV.

resting membrane potential

A _______________________________________ has more negative charges on the inside of it than in the extracellular space around it.

resting neuron

Neurons have a resting membrane potential because outside there are a bunch of positively charged ____________________ ions.

sodium

The measure of potential energy generated by separate charges is ____________________.

voltage