Describe what is meant by the resting membrane potential.

No net flow of ions across the membrane.

Define an action potential.

Wave of electrical excitation along a neuron’s plasma membrane.

State the effect of depolarisation on the membrane potential.

more positive value inside neurone

Describe what happens to the membrane potential during repolarisation.

more negative value inside neurone

Define what is meant by a nerve impulse in terms of the membrane potential

Change in the membrane potential of the neurone’s plasma membrane resulting in depolarisation.

State one way of degrading neurotransmitters in the synapse

enzymes OR reuptake protein into presynaptic neuron.

Explain why it is necessary to degrade neurotransmitters in the synapse.

Prevents continual stimulation of nerve impulse by neurotransmitter degradation.

Step the order of channel proteins involved in a nerve impulse.

1. Ligand gated Na channel 2. Voltage gated Na channel 3. Voltage gated K channel.

Which two channels contribute to depolarisation.

1. Ligand gated Na channel 2. Voltage gated Na channel

State the first step in nerve transmission following release of neurotransmitter into the synapse.

Neurotransmitters bind to their ligand gated channel on post synaptic membrane

Describe the result of a neurotransmitter binding to its ligand gated channel.

This causes an influx of positive Na ions into cell.

State what is required for voltage gated Na channels to open.

Sufficient Na ion movement into neurone OR membrane depolarised beyond threshold value

Help

Options

focusNode

Didn't know it?
click below

Knew it?
click below

Don't Know

Remaining cards (0)

Know

retry

shuffle

restart

0:00

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Nerve Impulse

Question	Answer
Describe what is meant by the resting membrane potential.	No net flow of ions across the membrane.
Define an action potential.	Wave of electrical excitation along a neuron’s plasma membrane.
State the effect of depolarisation on the membrane potential.	more positive value inside neurone
Describe what happens to the membrane potential during repolarisation.	more negative value inside neurone
Define what is meant by a nerve impulse in terms of the membrane potential	Change in the membrane potential of the neurone’s plasma membrane resulting in depolarisation.
State one way of degrading neurotransmitters in the synapse	enzymes OR reuptake protein into presynaptic neuron.
Explain why it is necessary to degrade neurotransmitters in the synapse.	Prevents continual stimulation of nerve impulse by neurotransmitter degradation.
Step the order of channel proteins involved in a nerve impulse.	1. Ligand gated Na channel 2. Voltage gated Na channel 3. Voltage gated K channel.
Which two channels contribute to depolarisation.	1. Ligand gated Na channel 2. Voltage gated Na channel
Which channel protein contributes to repolarisation.	Voltage gated K channel
State the first step in nerve transmission following release of neurotransmitter into the synapse.	Neurotransmitters bind to their ligand gated channel on post synaptic membrane
Describe the result of a neurotransmitter binding to its ligand gated channel.	This causes an influx of positive Na ions into cell.
State what is required for voltage gated Na channels to open.	Sufficient Na ion movement into neurone OR membrane depolarised beyond threshold value
State what type of Na channel is responsible for the large rapid depolarisation of the membrane.	Voltage gated Na channel
State what type of channel causes repolarisation of the membrane potential.	Voltage gated K channels.
State how the ion concentration gradients are restored following repolarisation.	Na/K pump
Name the ion and the direction of movement that causes depolarisation in a nerve impulse.	Na ions entering the cell.
Name the ion and the direction of movement that causes repolarisation in a nerve impulse.	K ions leaving the cell.

Created by: brightminds

"Know" box contains:
Time elapsed:
Retries: