17 Questions
What is the result of Na+ ions diffusing into the postsynaptic neuron?
Depolarization of the postsynaptic membrane
When do the Na+ ion channels close in the postsynaptic neuron?
When the neurotransmitters detach from the receptors
What happens to neurotransmitters after they detach from the receptors in the synaptic cleft?
Immediate degradation by specific enzymes
What occurs when ligand-gated ion channels in the postsynaptic neuron close?
Synaptic activity stops
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
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.
What type of ion channels are present in the axon for impulse transmission?
Voltage-gated Na+ channels
How does cocaine affect the reuptake of dopamine at the synapse?
Cocaine blocks the reuptake of dopamine by binding to the dopamine transporter.
Which type of ion channel is present at the postsynaptic membrane for neurotransmitter reception?
Ligand-gated ion channel
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.
What role do neurotransmitters play in impulse transmission across the synapse?
Neurotransmitters are required for transmitting impulses across the synaptic cleft.
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.
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.
What happens after neurotransmitters are released into the synaptic cleft?
Neurotransmitters bind to receptors on the postsynaptic membrane, potentially opening ligand-gated ion channels.
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.
Which of the following statements about ligand-gated ion channels is correct?
They are located on the postsynaptic membrane and contain receptors for neurotransmitters.
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.
Test your knowledge on the mechanism of impulse transmission across synapse. Learn about how neurotransmitters bind to receptors, causing ligand-gated ion channels to open, leading to depolarization of the postsynaptic membrane and the generation of action potentials.
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