Neuroscience: Synaptic Transmission Quiz
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Questions and Answers

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?

  • 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?

  • 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?

    <p>Chemical messengers are used to transmit signals in only one direction.</p> Signup and view all the answers

    What is the primary function of the synaptic cleft?

    <p>To separate the presynaptic and postsynaptic membranes.</p> Signup and view all the answers

    What occurs when a stimulus is subthreshold?

    <p>No action potential results.</p> Signup and view all the answers

    Which phase of the action potential is characterized by the opening of Na+ channels?

    <p>Depolarization phase</p> Signup and view all the answers

    What is the role of the Na+/K+ pump after an action potential?

    <p>It restores the membrane potential back to resting membrane potential (RMP).</p> Signup and view all the answers

    Which of the following describes the phenomenon of hyperpolarization?

    <p>The efflux of K+ causes the membrane to become more negative than RMP.</p> Signup and view all the answers

    What characterizes the all-or-none principle of action potentials?

    <p>All action potentials have the same amplitude irrespective of the stimulus strength.</p> Signup and view all the answers

    What is the main function of graded potentials in neuronal signaling?

    <p>To generate an action potential if they reach threshold.</p> Signup and view all the answers

    In the context of synapses, what is one key characteristic of electrical synapses?

    <p>They allow direct electrical communication between neurons.</p> Signup and view all the answers

    What defines the threshold potential necessary to initiate an action potential?

    <p>Cumulative graded potentials or a large graded potential from a single stimulus.</p> Signup and view all the answers

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