nerve impulse

Multiple neurons

Fibers of multiple neurons and their surrounding connective tissue

Same thing as a neuron

Tissue that passes on signals to our brain

Polarized (the charge inside is different than the charge outside in the extracellular fluid)

Positive inside and outside

Negative outside and positive inside

Depolarized

Passive Transport

Active transport

2 Na+ and 3 K+

3 Na+ and 3 K+

3 Na+ and 2 K+

5 Na+ and 4 K+

more Na+ channels in the membrane

an equal amount of channels in the membrane

less K+ channels in the membrane

less Na+ channels in the membrane

less Na+ diffuses back

potassium inside is negative

more K+ diffuses out

negatively charged proteins and nucleic acids

Each channel opens after the inside reached -70 mV

More channels open, one by one

Each channel will open after the first one

All channels open

Na+ will diffuse in

Na+ will diffuse out

K+ will diffuse in

Neuron becomes less negative

K+ diffuses in

the charge is more negative

K+ diffuses out

the charge is less negative