9.2 Action Potential Organiser

0.0(0)
Studied by 0 people
call kaiCall Kai
Locked
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/6

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 3:23 PM on 7/28/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai
Chat

No analytics yet

Send a link to your students to track their progress

7 Terms

1
New cards

Stages of the Action Potential

knowt flashcard image
2
New cards

Stage 1: resting

  • Voltage gated Na+ and K+ channels are closed.

  • Membrane is negative on the inside and positive on the outside.

  • Neuron membrane is polarised and at resting membrane potential(-70mV).

<ul><li><p>Voltage gated Na+ and K+ channels are closed. </p></li><li><p>Membrane is negative on the inside and positive on the outside. </p></li><li><p>Neuron membrane is polarised and at resting membrane potential(-70mV).</p></li></ul><p></p>
3
New cards

Stage 2: Stimulus → Threshold

  • A stimulus causes the ligand-gated Na+ channels to open.

  • Some Na+ begins to diffuse into the cell.

  • The inside of the cell becomes less negative.

  • If the stimulus is strong enough and the inside of the cell becomes -55mV then the threshold is reached.

<ul><li><p>A stimulus causes the ligand-gated Na+ channels to open. </p></li><li><p>Some Na+ begins to diffuse into the cell. </p></li><li><p>The inside of the cell becomes less negative. </p></li><li><p>If the stimulus is strong enough and the inside of the cell becomes -55mV then the threshold is reached.</p></li></ul><p></p>
4
New cards

stage 3: depolarisation

  • Once threshold is reached the voltage-gated Nat channels open.

  • This causes the rapid diffusion of Nat into the cell.

  • The cell membrane is depolarised as the inside of the cell becomes more positive compared to the outside.

<ul><li><p>Once threshold is reached the voltage-gated Nat channels open.</p></li><li><p>This causes the rapid diffusion of Nat into the cell.</p></li><li><p>The cell membrane is depolarised as the inside of the cell becomes more positive compared to the outside.</p></li></ul><p></p>
5
New cards

Stage 4: Depolarisation

  • Voltage gated Na+ channels close.

  • Voltage gated K+ channels open

  • K+ ions diffuse rapidly out of the cell.

  • Cell membrane is repolarised.

<ul><li><p>Voltage gated Na+ channels close. </p></li><li><p>Voltage gated K+ channels open </p></li><li><p>K+ ions diffuse rapidly out of the cell.</p></li><li><p>Cell membrane is repolarised.</p></li></ul><p></p>
6
New cards

Stage 5: Hyperpolarisation

  • Voltage gated K+ channels are slow to close.

  • K+ continue to leave the cell until the K+ channels close.

  • membrane becomes hyperpolarized.

<ul><li><p>Voltage gated K+ channels are slow to close. </p></li><li><p>K+ continue to leave the cell until the K+ channels close. </p></li><li><p>membrane becomes hyperpolarized.</p></li></ul><p></p>
7
New cards

Stage 6: Resting

  • The Sodium-potassium pump uses ATP to pump 3 Na+ out of the cell and 2 K+ into the cell.

  • Resting membrane potential is restored

<ul><li><p>The Sodium-potassium pump uses ATP to pump 3 Na+ out of the cell and 2 K+ into the cell. </p></li><li><p>Resting membrane potential is restored</p></li></ul><p></p>