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Questions and Answers
What is the role of calcium influx during synaptic transmission?
What is the role of calcium influx during synaptic transmission?
- It directly depolarizes the postsynaptic neuron.
- It activates ionotropic receptors.
- It triggers the release of neurotransmitter by exocytosis. (correct)
- It facilitates ligand binding to metabotropic receptors.
Which of the following correctly describes ionotropic receptors?
Which of the following correctly describes ionotropic receptors?
- They work independently of neurotransmitters.
- They lock and unlock channels like metabotropic receptors.
- They allow the exchange of ions upon neurotransmitter binding. (correct)
- They activate G-proteins to open channels.
What occurs after the neurotransmitter binds to ligand-gated channels?
What occurs after the neurotransmitter binds to ligand-gated channels?
- Sodium influx into the postsynaptic membrane. (correct)
- Hyperpolarization of the postsynaptic neuron.
- Neurotransmitter reuptake by the presynaptic neuron.
- Calcium influx into the postsynaptic membrane.
What characterizes the unidirectional nature of chemical synapses?
What characterizes the unidirectional nature of chemical synapses?
What is the primary function of the synaptic cleft?
What is the primary function of the synaptic cleft?
What occurs when a stimulus is subthreshold?
What occurs when a stimulus is subthreshold?
Which phase of the action potential is characterized by the opening of Na+ channels?
Which phase of the action potential is characterized by the opening of Na+ channels?
What is the role of the Na+/K+ pump after an action potential?
What is the role of the Na+/K+ pump after an action potential?
Which of the following describes the phenomenon of hyperpolarization?
Which of the following describes the phenomenon of hyperpolarization?
What characterizes the all-or-none principle of action potentials?
What characterizes the all-or-none principle of action potentials?
What is the main function of graded potentials in neuronal signaling?
What is the main function of graded potentials in neuronal signaling?
In the context of synapses, what is one key characteristic of electrical synapses?
In the context of synapses, what is one key characteristic of electrical synapses?
What defines the threshold potential necessary to initiate an action potential?
What defines the threshold potential necessary to initiate an action potential?
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