WK 2: Membranes and Action potentials
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Questions and Answers

What is the effect of inhibition on the resting membrane potential?

  • It becomes more negative (correct)
  • It becomes zero
  • It becomes more positive
  • It remains the same

    • What is the primary mechanism that drives the membrane excitability in neurons?

  • Mechanically gated channels
  • Chemically gated channels
  • Voltage gated channels (correct)
  • Light gated channels

    • What happens to the resting membrane potential during depolarization?

  • It becomes zero
  • It becomes more negative
  • It becomes more positive (correct)
  • It remains the same

    • What is the direction of ion flow during depolarization?

    <p>Positive ions enter the cell</p> Signup and view all the answers

    What is the term for the minimum amount of depolarization required to trigger an action potential?

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

    What is the effect of excitatory potentials on the resting membrane potential?

    <p>It becomes more positive</p> Signup and view all the answers

    What happens to the membrane potential during depolarization?

    <p>It becomes less negative</p> Signup and view all the answers

    What is the duration of an action potential?

    <p>Around 1 millisecond</p> Signup and view all the answers

    What is the principle that describes the generation of action potentials?

    <p>All or None principle</p> Signup and view all the answers

    What is the term for the brief reversal of the membrane potential during an action potential?

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

    What type of ion channels are involved in the generation of action potentials?

    <p>Voltage-gated ion channels</p> Signup and view all the answers

    What is the term for the period when the membrane potential is more negative than usual?

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

    What is the zone where action potentials are initiated?

    <p>Axon hillock</p> Signup and view all the answers

    What is responsible for the depolarization phase of an action potential?

    <p>Sodium conductance</p> Signup and view all the answers

    What is the change in membrane potential that leads to an action potential?

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

    Who was the first to record the resting membrane potential and action potential from a living neuron?

    <p>Alan L. Hodgkin and Andrew F. Huxley</p> Signup and view all the answers

    What is the term for the minimum amount of current density required to generate an action potential?

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

    Where do action potentials propagate along the neuron?

    <p>From axon hillock to axon terminals</p> Signup and view all the answers

    What is the primary function of the nervous system?

    <p>To interpret, store, and respond to information received from inside and outside the body</p> Signup and view all the answers

    What is the term for the movement of ions into a neuron that causes the membrane potential to become more negative?

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

    What is the minimum amount of depolarization required for an action potential to occur?

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

    What is the process by which an action potential travels along the length of a neuron?

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

    What is the term for the state of a neuron when it is not actively generating an action potential?

    <p>Resting membrane potential</p> Signup and view all the answers

    What is the structure responsible for generating action potentials in neurons?

    <p>Excitable membrane</p> Signup and view all the answers

    What is the main function of the axon terminals?

    <p>To transmit signals to other neurons or to muscles or glands</p> Signup and view all the answers

    Which type of neuron has a single axon with multiple dendrites?

    <p>Multipolar neuron</p> Signup and view all the answers

    What is the typical resting membrane potential of a neuron?

    <p>-65 mV</p> Signup and view all the answers

    What is the primary means of communication between neurons?

    <p>Electrochemical signals</p> Signup and view all the answers

    What is the structure that surrounds the cytoplasm of living cells and separates the intracellular components from the extracellular environment?

    <p>Cell membrane</p> Signup and view all the answers

    What is the term for the potential difference across a cell membrane?

    <p>Membrane potential</p> Signup and view all the answers

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