LIFSCI 7B XL - Animation: Reading
Phylogenies Copy Questions and
Answers Rated A+
What is the role of the axon hillock in neural signaling?
The axon hillock integrates incoming signals and determines whether to initiate an action
potential.
How does myelination affect the speed of acti...
LIFSCI 7B XL - Animation: Reading
Phylogenies Copy Questions and
Answers Rated A+
What is the role of the axon hillock in neural signaling?
✔✔ The axon hillock integrates incoming signals and determines whether to initiate an action
potential.
How does myelination affect the speed of action potential propagation along an axon?
✔✔ Myelination increases the speed of action potential conduction by enabling saltatory
conduction, where the signal jumps between nodes of Ranvier.
Why do voltage-gated sodium channels play a crucial role during depolarization?
✔✔ These channels open in response to changes in membrane potential, allowing sodium ions to
rush into the cell, leading to depolarization and the generation of an action potential.
What is the significance of the refractory period in action potential generation?
✔✔ The refractory period ensures that action potentials move in one direction along the axon
and prevents the neuron from firing again too quickly.
1
, How do neurotransmitters facilitate communication between neurons at synapses?
✔✔ Neurotransmitters are released into the synaptic cleft and bind to receptors on the
postsynaptic membrane, leading to the initiation or inhibition of an action potential in the next
neuron.
What is the role of the sodium-potassium pump in maintaining resting membrane potential?
✔✔ The pump maintains resting membrane potential by actively transporting sodium ions out of
the cell and potassium ions into the cell, creating an electrochemical gradient.
How do ligand-gated ion channels differ from voltage-gated ion channels?
✔✔ Ligand-gated ion channels open in response to the binding of specific molecules (ligands),
while voltage-gated ion channels open in response to changes in membrane potential.
What is the function of the synaptic vesicles in the presynaptic neuron?
✔✔ Synaptic vesicles store neurotransmitters that are released into the synaptic cleft during
neurotransmission to communicate with the postsynaptic cell.
Why is the threshold potential important in the generation of an action potential?
2
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