Generation of a nerve impulse (C&S) Flashcards

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1
Q

Step 1

A

Binding of a neurotransmitter triggers the opening of ligand-gated ion channels at a synapse.

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2
Q

Step 2

A

Ion movement occurs and there is
depolarisation of the plasma membrane.

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3
Q

Step 3

A

If sufficient ion movement occurs, and the membrane is depolarised beyond a threshold value, the opening of voltage-gated sodium channels is triggered and sodium ions enter the cell down their electrochemical gradient.

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4
Q

Step 4

A

This leads to a rapid and large change in the membrane potential.

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5
Q

Step 5

A

A short time after opening, the sodium channels become inactivated.

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6
Q

Step 6

A

Voltage-gated potassium channels then open to allow potassium ions to move out of the cell to restore the resting membrane potential.

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