Nervous 1

Created by EmilyLloyd 

Upgrade to
remove ads

charge

Neurons have a ___ (AKA electrical potential) made by the difference in charged particles across that membrane.

volts

charge is measured in ___

-70, -90

RMP is ___mV in neurons and ___mV in muscle cells

F

[T,F] the extracellular charge is more negative than intracellular charge

proteins

inside the cell are large anions, specifically ____, which contribute to the ICF negativity

K+

The main IC ion in neurons

Na+

The main EC ion in neurons

K+

Most important ion in maintaining RMP.

T

[T,F] K+ is more permeable than Na+, making it the most important ion in maintaining RMP.

3, 2

ratio of Na-K pump: _ Na+ to _ K+

active (1 ATP for every 3Na:2K movement)

the Na-K pump uses ___ transport

ATP

___ is made from glucose and O2 during aerobic respiration.

F (stimuli may depolarize and generate local potentials w/o generating APs)

[T,F] If a stimuli is strong enough to open Na-gated channels, it is strong enough to become an AP rather than just a local potential

local

short distance current: ___ potential

local

___ potentials (action or local) occur at the junctions of neurons

dendrites

the parts of the nerve cell where information is received

local, action

___ potentials are achieved through gated channels, while ___ are achieved through voltage gated channels

-55

___mV is the threshold level of depolarization needed to reach an AP from a local potential

trigger zone

If enough local potentials spread to the ___ ___ (the axon hillock area), it activates voltage gated channels and an AP fires

35

peek voltage during an AP is ___mV. This is when the cell is very depolarized and Na+ channels finally close.

hyperpolarization

Occurs b/c K+ channels are slow to close, allowing K+ to flow out for a bit longer down its concentration gradient (making ICF super negative)

refractory

during the ___ period, it's difficult to re-stimulate an AP immediately after "firing"

absolute, relative

The refractory period is broken into the ____ refractory period and the ___ refractory period

absolute refractory

during the ___ ___ period, it's impossible to generate another AP b/c Na+ channels are still open and the former AP is still going.

relative refractory

during the ___ ___ period, it takes a very intense stimulus to generate another AP since the K+ channels are still open

Na+

during the absolute refractory period, it's impossible to generate another AP since the ___ channels are still open

K+

during the relative refractory period, it takes a very intense stimulus to generate another AP since the ___ channels are still open

schwann cells

form myelin sheaths on axons of nerves located in the peripheral nervous system

oligodendrocytes

form myelin sheaths on axons of nerves located in the central nervous system.

myelinated

signal conduction is much faster in ___ fibers.

nodes of Ranvier

where Na+ flows into the axon in myelinated fibers

nodes of Ranvier

where APs are generated in myelinated fibers

Saltatory Conduction

the name for signal conduction through myelinated fibers. Quick, relies on Na+ entering through the nodes and powering the AP through the internodes

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set