Wk 4 Nerve Physiology Flashcards Preview

BIOL1 > Wk 4 Nerve Physiology > Flashcards

Flashcards in Wk 4 Nerve Physiology Deck (16):

When a neutron is not stimulated, what is it called?

A resting cell and is polarised


A cell has a difference in charge across its membrane; more positive on the outside than inside

Is this true?



Na+ ions are concentrated on the ......

Outside of a membrane


Negatively charged ions, K+ ions and proteins are on the ......

Inside of a membrane


Neurones and muscle cells rely on 4 types of ion channels, what are they? And when do they open/close

Leakage channels- the gates randomly alternate between open and close positions (sameeeee)

Chemical gated channels- open and close in response to a specific chemical / ligand stimulus

Voltage gated channels- open in response to a change in membrane potential (voltage). Participate in generation and conductance of aps

Mechanically gated channels- open and close in response to a mechanical stimulation in form of vibration ( sound waves) pressure (touch) or tissue stretching.


Tell me bout polarised state

the outside is more positive than inside

That sounds a bit depressing, doesn't it?


Where is the Na+/K+ pump located and what it do

It's located in the glorious cell membrane
It corrects the imbalance of ions across cell membrane by pumping a bit of 3Na+ ions out while pumping 2K+ ions in.

And it uses energy from ATP for the active transport of ions (against their concentration gradients)


What's it called when a nerve is stimulated and the resting potential changes

A nerve impulse

Examples of such stimuli are pressure, electricity, chemicals. Ect.


What does action potential mean?

Is the rapid change in polarity that moves along the nerve fibre


The moving change in polarity has a bunch of different stages, name 3 pls

Depolarisation ⬆️

Re polarisation ⬇️

And refractory phase ⬇️⬇️


Action potential is when the membrane potential (ie the charge difference) changes and so does the balance

True or false



Net balance changes from -__ to +__ mV

-70 mV to +30mV

And it's gotta go back again - the signal that makes this occur is action potential.


What's it's called when the action potential spreads along the axon membrane???

It's called a continuous propagation.


Nerve impulse also known as AP is propagated along a nerve process. (Dendrite or axon )

Which one can transmit an AP and what one can only generate (start) one?

A dendrite can transmit an AP
but and axon can only start one.


____________ is a short period of time during which the nerve cell membrane can't be depolarised;sodium gates cannot be opened again until the membrane is repolarised to its normal resting potential (basically can't do shit)

Refractory phase


What's salutatory conduction

The super duper fast transmission in myelinated neurons