Biology HL
Biology HL
4
Chapters
553
Notes
Theme A - Unity & diversity
Theme A - Unity & diversity
Theme B - Form & Function
Theme B - Form & Function
Theme C - Interaction &  Interdependence
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Theme D - Continuity & Change
IB Resources
Theme C - Interaction &  Interdependence
Biology HL
Biology HL

Theme C - Interaction & Interdependence

Unlocking Action Potential Secrets: Depolarization

Word Count Emoji
443 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

Action potentials - the electric dance of our nerves

Imagine our neurons as a disco dance floor. Each move, each change, represents a part of the neuron's dance!

The move list

  • Depolarization: When the neuron goes from its chill zone (at -70mV) and gets excited to +30mV.

    Real-World Example: It's like flipping a light switch ON, suddenly illuminating a dark room!

  • Repolarization: After the excitement, the neuron needs to relax back to its original state.

    Real-World Example: After the party, you need some rest to recharge for the next day.

The voltage-gating mechanism - the dance trigger

Just like dance moves are triggered by the beat of the music, these processes are controlled by voltage-gating.

  • If our neuron feels an increase in voltage from -70mV to -50mV, it's like the DJ dropping the beat. This gets the sodium channels to open up, welcoming sodium ions to the party inside the axon.

    Did you know? This is a classic case of positive feedback - the more the party heats up, the more friends (or sodium ions) come in!

Threshold potential - the VIP pass to the neuron party

  • Before any of this starts, the neuron checks for the "VIP Pass" – this is our threshold potential.

    Fun Fact: If we don't have the pass (or if the threshold isn't reached), there's no party! The neuron goes back to its resting mode at -70mV.

  • This whole process is all-or-nothing. Think of it as a concert: either you're in, or you're out.

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IB Resources
Theme C - Interaction &  Interdependence
Biology HL
Biology HL

Theme C - Interaction & Interdependence

Unlocking Action Potential Secrets: Depolarization

Word Count Emoji
443 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

Action potentials - the electric dance of our nerves

Imagine our neurons as a disco dance floor. Each move, each change, represents a part of the neuron's dance!

The move list

  • Depolarization: When the neuron goes from its chill zone (at -70mV) and gets excited to +30mV.

    Real-World Example: It's like flipping a light switch ON, suddenly illuminating a dark room!

  • Repolarization: After the excitement, the neuron needs to relax back to its original state.

    Real-World Example: After the party, you need some rest to recharge for the next day.

The voltage-gating mechanism - the dance trigger

Just like dance moves are triggered by the beat of the music, these processes are controlled by voltage-gating.

  • If our neuron feels an increase in voltage from -70mV to -50mV, it's like the DJ dropping the beat. This gets the sodium channels to open up, welcoming sodium ions to the party inside the axon.

    Did you know? This is a classic case of positive feedback - the more the party heats up, the more friends (or sodium ions) come in!

Threshold potential - the VIP pass to the neuron party

  • Before any of this starts, the neuron checks for the "VIP Pass" – this is our threshold potential.

    Fun Fact: If we don't have the pass (or if the threshold isn't reached), there's no party! The neuron goes back to its resting mode at -70mV.

  • This whole process is all-or-nothing. Think of it as a concert: either you're in, or you're out.

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Biology HL. Subscribe now and get closer to that 45 🌟