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