Impulse Transmission Across Synapse Mechanism Quiz

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What is the result of Na+ ions diffusing into the postsynaptic neuron?

Hyperpolarization of the postsynaptic membrane

Closure of the ligand-gated ion channels

Synaptic inhibition

Depolarization of the postsynaptic membrane (correct)

When do the Na+ ion channels close in the postsynaptic neuron?

During the depolarization phase

While recycling neurotransmitters

When the ligand-gated ion channels open

When the neurotransmitters detach from the receptors (correct)

What happens to neurotransmitters after they detach from the receptors in the synaptic cleft?

Immediate degradation by specific enzymes (correct)

Repackaging into synaptic vesicles

Activation of the Na+ ion channels

Recycling by direct diffusion into the postsynaptic neuron

What occurs when ligand-gated ion channels in the postsynaptic neuron close?

Synaptic activity stops Signup and view all the answers

In the mechanism of impulse transmission across synapses, what leads to the generation of an action potential in the postsynaptic neuron?

Depolarization due to Na+ influx Signup and view all the answers

What is the main difference between impulse transmission along the axon and across the synapse?

Impulses are electrically transmitted along the axon, while across the synapse, they are chemically transmitted. Signup and view all the answers

What type of ion channels are present in the axon for impulse transmission?

Voltage-gated Na+ channels Signup and view all the answers

How does cocaine affect the reuptake of dopamine at the synapse?

Cocaine blocks the reuptake of dopamine by binding to the dopamine transporter. Signup and view all the answers

Which type of ion channel is present at the postsynaptic membrane for neurotransmitter reception?

Ligand-gated ion channel Signup and view all the answers

In a normal neural communication process, what happens to dopamine after it binds to receptors at the postsynaptic membrane?

Dopamine is recycled back into the synaptic knob by a specialized protein. Signup and view all the answers

What role do neurotransmitters play in impulse transmission across the synapse?

Neurotransmitters are required for transmitting impulses across the synaptic cleft. Signup and view all the answers

What is the first step in the mechanism of impulse transmission across a synapse?

Action potentials arrive at the synaptic knob of the axon terminal of the presynaptic membrane, causing depolarization. Signup and view all the answers

What is the role of calcium ions in the mechanism of impulse transmission across a synapse?

Calcium ions trigger the fusion of synaptic vesicles with the presynaptic membrane, leading to the release of neurotransmitters. Signup and view all the answers

What happens after neurotransmitters are released into the synaptic cleft?

Neurotransmitters bind to receptors on the postsynaptic membrane, potentially opening ligand-gated ion channels. Signup and view all the answers

What is the final step in the mechanism of impulse transmission across a synapse?

An action potential is generated in the dendrite of the downstream (postsynaptic) neuron. Signup and view all the answers

Which of the following statements about ligand-gated ion channels is correct?

They are located on the postsynaptic membrane and contain receptors for neurotransmitters. Signup and view all the answers

What is the purpose of the synaptic cleft in the mechanism of impulse transmission?

It allows for the diffusion of neurotransmitters from the presynaptic to the postsynaptic neuron. Signup and view all the answers