IB Biology Topic C2.2.6 Release of Neurotransmitters from a Presynaptic Membrane Revision Notes (SL/HL)

IB Biology Topic C2.2.6 Release of Neurotransmitters from a Presynaptic Membrane Revision Notes (SL/HL) | RevisionDojo

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An action potential reaching the presynaptic terminal triggers neurotransmitter release

Release of neurotransmitter from the presynaptic membrane is the step that lets a signal pass from one neuron to the next cell.
The presynaptic membrane is the end of the axon, also called the axon terminal.

Analogy

The signal cannot jump the gap, so the neuron loads it onto a chemical ferry that carries it across.
The neurotransmitter is that ferry, carrying the message across the synaptic cleft.

Depolarization of the terminal opens voltage-gated calcium channels

An action potential travels down the axon and arrives at the presynaptic terminal.
Its arrival depolarizes the presynaptic membrane, making the inside less negative.
This depolarization opens voltage-gated calcium channels in the membrane.

Definition

Depolarization

A change in the membrane potential of the presynaptic neuron, making it more positive.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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An action potential reaching the presynaptic terminal triggers neurotransmitter release

Release of neurotransmitter from the presynaptic membrane is the step that lets a signal pass from one neuron to the next cell.
The presynaptic membrane is the end of the axon, also called the axon terminal.

Analogy

The signal cannot jump the gap, so the neuron loads it onto a chemical ferry that carries it across.
The neurotransmitter is that ferry, carrying the message across the synaptic cleft.

Depolarization of the terminal opens voltage-gated calcium channels

An action potential travels down the axon and arrives at the presynaptic terminal.
Its arrival depolarizes the presynaptic membrane, making the inside less negative.
This depolarization opens voltage-gated calcium channels in the membrane.

Definition

Depolarization

A change in the membrane potential of the presynaptic neuron, making it more positive.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C2.2.6: Release of Neurotransmitters from a Presynaptic Membrane Notes

An action potential reaching the presynaptic terminal triggers neurotransmitter release

Depolarization of the terminal opens voltage-gated calcium channels

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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An action potential reaching the presynaptic terminal triggers neurotransmitter release

Depolarization of the terminal opens voltage-gated calcium channels

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics