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Synaptic Transmission

Authored by Lisa Thompson

Science

12th Grade

NGSS covered

Synaptic Transmission
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25 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Electrical synapses involve ___ whereas chemical synapses involve ___.

direct electrical connections; release and reception of neurotransmitters

direct electrical connections; release and reception of hormones

indirect electrical connections; release and reception of neurotransmitters

direct chemical connections; release and reception of hormones

indirect chemical connections; release of electrical signals

Answer explanation

Electrical synapses involve direct electrical connections between neurons, allowing for rapid signal transmission. In contrast, chemical synapses rely on the release and reception of neurotransmitters to communicate between neurons.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the action of the neurotransmitter at a chemical synapse?

It acts on receptors in the postsynaptic membrane.

It electrically activates the presynaptic neuron

It crosses the postsynaptic membrane and then activates ion channels in the postsynaptic neuron.

It depolarizes the postsynaptic membrane by delivering an electrical charge.

It transfers an action potential from the presynaptic neuron to the postsynaptic neuron.

Answer explanation

The correct choice is that the neurotransmitter acts on receptors in the postsynaptic membrane, initiating a response in the postsynaptic neuron. This is the primary function of neurotransmitters at chemical synapses.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which event is the first in the series of events that take place during chemical synaptic transmission?

Neurotransmitter binds to its receptors.

Influx of Ca2+ in the presynaptic terminal.

Voltage-gated Ca2+ channels open.

Neurotransmitter is released into the synaptic cleft.

Synaptic vesicles fuse with the presynaptic membrane.

Answer explanation

The first event in chemical synaptic transmission is the opening of voltage-gated Ca2+ channels. This allows Ca2+ to enter the presynaptic terminal, triggering subsequent events like neurotransmitter release.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

At which point during signal transmission at a chemical synapse is exocytosis occurring?

As neurotransmitter binds to its receptors.

While Ca2+ enters the presynaptic terminal.

As voltage-gated Ca2+ channels are opening.

During neurotransmitter release into the synaptic cleft.

During reuptake, as synaptic vesicles are reformed from the plasma membrane.

Answer explanation

Exocytosis occurs during neurotransmitter release into the synaptic cleft, where neurotransmitters are expelled from synaptic vesicles into the space between neurons, facilitating communication.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the main role of calcium ions in synaptic transmission?

To block neurotransmitter release

To trigger neurotransmitter release

To store neurotransmitters

To insulate the synaptic cleft

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How do calcium ions enter the presynaptic neurone?

Through sodium channels

Through potassium channels

Through voltage-gated calcium channels

Through ligand-gated calcium channels

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the chemical used by a neuron to transmit an impulse across a synapse to another nerve cell?

Neurotransmitters

Synapse

Threshold

Impulse

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