Nervous Impulse

What is the nerve?

• Multiple neurons

• Fibers of multiple neurons and their surrounding connective tissue

• Same thing as a neuron

• Tissue that passes on signals to our brain

What is the unstimulated neurons charge inside and outside?

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

• Positive inside and outside

• Negative outside and positive inside

• Depolarized

Normal nerve cell charge (resting potential)

What is used to pump Na+ outside of the neuron and bring K+ inside?

• Passive Transport

• Active transport

How many K+ and Na+ ions do the Na+/K+ pumps pump?

• 2 Na+ and 3 K+

• 3 Na+ and 3 K+

• 3 Na+ and 2 K+

• 5 Na+ and 4 K+

There are...

• 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

The charge inside the membrane is negative because:

• less Na+ diffuses back

• potassium inside is negative

• more K+ diffuses out

• negatively charged proteins and nucleic acids

What is graded response?

• 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

What happens when Na+ channels open?

• Na+ will diffuse in

• Na+ will diffuse out

• K+ will diffuse in

• Neuron becomes less negative

What happens when the K+ channels open?

• K+ diffuses in

• the charge is more negative

• K+ diffuses out

• the charge is less negative