Neuroelectrical Signaling Process Quiz
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Questions and Answers

What is the resting membrane potential of a neuron?

  • About -30mV
  • About -70mV (correct)
  • About +70mV
  • About -90mV

    • What happens during the depolarization phase of an action potential?

  • The potential becomes more negative
  • The potential moves from less negative to more negative
  • +30mV triggers Na+ and K+ channels to close
  • Na+ channels open and K+ channels close (correct)

    • What is the threshold potential that needs to be met to start depolarization?

  • Summate to a depolarization of 5mV or more
  • Summate to a depolarization of 20mV or more
  • Summate to a depolarization of 10mV or more
  • Summate to a depolarization of 15mV or more (correct)

    • What characterizes hyperpolarization in a neuron's action potential?

    <p>The potential becomes more negative</p> Signup and view all the answers

    What are EPSPs and IPSPs in relation to the threshold potential?

    <p>They both increase the likelihood of reaching threshold potential</p> Signup and view all the answers

    What is the role of myelin in the nervous system?

    <p>Reduces metabolic cost and saves room in the nervous system</p> Signup and view all the answers

    What is the role of an IPSP in a neuron?

    <p>Makes the postsynaptic neuron less likely to generate an action potential</p> Signup and view all the answers

    What does an increase of Calcium into the axon terminal signal?

    <p>The vesicles to bind to the plasma membrane via SNARE proteins</p> Signup and view all the answers

    What is the sequence of events in a reflex arc?

    <p>Sensory input, interneuron, efferent neuron, motor output, afferent neuron</p> Signup and view all the answers

    What happens during neurotransmitter release at the synapse?

    <p>Calcium enters the axon terminal and neurotransmitters in vesicles are released into the synaptic cleft</p> Signup and view all the answers

    During which phase of an action potential does the potential move from less negative to more negative?

    <p>Repolarization</p> Signup and view all the answers

    What triggers Na+ channels to close and K+ channels to open during an action potential?

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

    Which process describes the way an electrical impulse skips from node to node down the full length of an axon?

    <p>Saltatory Conduction</p> Signup and view all the answers

    What is the voltage needed to be met to start depolarization during an action potential?

    <p>+15mV</p> Signup and view all the answers

    What characterizes the resting membrane potential of a neuron?

    <p>Na+ channels closed and K+ channels open</p> Signup and view all the answers

    What is the role of myelin in the nervous system?

    <p>Myelin speeds up the transmission of action potentials and reduces the metabolic cost of signaling.</p> Signup and view all the answers

    What triggers Na+ channels to close and K+ channels to open during an action potential?

    <p>Depolarization of the neuron's membrane potential</p> Signup and view all the answers

    What is the voltage needed to be met to start depolarization during an action potential?

    <p>$-55$ mV</p> Signup and view all the answers

    What characterizes hyperpolarization in a neuron's action potential?

    <p>The membrane potential becomes more negative than the resting potential.</p> Signup and view all the answers

    During which phase of an action potential does the potential move from less negative to more negative?

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

    In chemical signaling, which of the following is responsible for making the extracellular fluid more positive by moving 3 sodium ions out of the cell?

    <p>Sodium (Na+)</p> Signup and view all the answers

    In the mechanism of a synapse, which process involves the removal of neurotransmitters from the synaptic cleft and is part of the cancellation of the signal?

    <p>Diffusion of the transmitter from the cleft</p> Signup and view all the answers

    What is the primary function of myelin in the nervous system?

    <p>Reduce nerve conduction resistance</p> Signup and view all the answers

    What role does calcium play in chemical signaling at the synapse?

    <p>It signals vesicles to bind to the plasma membrane</p> Signup and view all the answers

    Which division of neurons causes an effect and sends messages out from the peripheral nervous system (PNS)?

    <p>Efferent neurons</p> Signup and view all the answers

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