Put the following events of a signal crossing a synapse in...

Name: Problem 3, Chapter 26: Must Know High School Biology
Uploaded: 2019-08-14T21:41:49-08:00
Duration: 1 min 11 s
Channel: Aadit Sharma
Description: Put the following events of a signal crossing a synapse in the correct order: a. Neurotransmitter binds to the postsynaptic cell's membrane b. Calcium channels open c. Neurotransmitter is dumped into the synapse d. Vesicles containing neurotransmitter fuse to the presynaptic neuron's membrane e. Action potential hits the end of the neuron f. Sodium channels on postsynaptic cell open

Put the following events of a signal crossing a synapse in the correct order: a. Neurotransmitter binds to the postsynaptic cell's membrane b. Calcium channels open c. Neurotransmitter is dumped into the synapse d. Vesicles containing neurotransmitter fuse to the presynaptic neuron's membrane e. Action potential hits the end of the neuron f. Sodium channels on postsynaptic cell open

Put the following events of a signal crossing a synapse in the correct order:
a. Neurotransmitter binds to the postsynaptic cell's membrane
b. Calcium channels open
c. Neurotransmitter is dumped into the synapse
d. Vesicles containing neurotransmitter fuse to the presynaptic neuron's membrane
e. Action potential hits the end of the neuron
f. Sodium channels on postsynaptic cell open

Key Concepts

Neurotransmitter Binding

Once in the synaptic cleft, neurotransmitters diffuse across and bind to specific receptors on the postsynaptic cell's membrane. This binding is crucial because it triggers a response in the postsynaptic cell, often leading to the opening of ion channels.

Neurotransmitter Release

After vesicle fusion, neurotransmitters are expelled into the synaptic cleft, the small gap between neurons. This release allows the chemical signal to be transmitted from the presynaptic to the postsynaptic neuron.

Postsynaptic Ion Channel Activation

Following the binding of neurotransmitters, ion channels (such as sodium channels) on the postsynaptic membrane open. This change in permeability can generate a new electrical impulse in the postsynaptic neuron, continuing the process of neural communication.

Voltage-Gated Calcium Channels

At the presynaptic terminal, the arrival of an action potential causes voltage-gated calcium channels to open. The influx of calcium ions is critical for the next step in synaptic transmission because it triggers the vesicular release of neurotransmitters.

Action Potential Propagation

This concept refers to the electrical impulse traveling along a neuron. When the action potential reaches the neuron's terminal, it triggers subsequent processes involved in synaptic transmission. The initiation of the signal at the axon hillock propagates along the axon leading to depolarization at the synaptic terminal.

Vesicle Fusion

This refers to the process where neurotransmitter-containing vesicles merge with the presynaptic membrane. Calcium influx prompts these vesicles to fuse with the membrane, facilitating the release of their contents into the synaptic cleft.

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