Sodium and Potassium Channel States Quiz
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Questions and Answers

What is the defining characteristic of an action potential?

  • Slow hyperpolarization
  • Slow repolarization
  • Rapid depolarization followed by repolarization (correct)
  • Gradual depolarization
  • Which type of cells exhibit excitability?

  • Skin cells
  • Blood cells
  • Neurons and muscle cells (correct)
  • Bone cells
  • What is the role of a stimulus in altering membrane potential?

  • Maintaining membrane stability
  • Inducing rapid changes in membrane polarization (correct)
  • Preventing action potentials
  • Promoting hyperpolarization
  • What happens if a stimulation surpasses the excitability threshold?

    <p>It triggers an action potential</p> Signup and view all the answers

    Where does the excitability threshold typically lie for muscle and nerve cells?

    <p>-65mV to -55mV</p> Signup and view all the answers

    Which type of current brings the membrane potential closer to the excitability threshold?

    <p>'Cathélectrotonus' depolarizing current</p> Signup and view all the answers

    What is the primary function of potassium channels during an action potential?

    <p>Assisting in repolarization</p> Signup and view all the answers

    Which term describes an influx of negative charges that depolarize the cell?

    <p>'Cathélectrotonus'</p> Signup and view all the answers

    At what membrane potential does an action potential become inevitable?

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

    What does the term 'androecium' refer to?

    <p>Staminal whorl of the flower</p> Signup and view all the answers

    In the context of stamens, what is meant by 'meristemonous'?

    <p>The state of continuous growth at the tip</p> Signup and view all the answers

    Which term describes the phenomenon when stamen pieces are overlapping?

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

    What is the term for the regrouping of stamens in androecium?

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

    In which type of androecium are stamens completely fused into a single structure?

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

    What is the term for a type of androecium where stamens are free and do not fuse at any point?

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

    Which term describes the arrangement of flower pieces as one piece covering two pieces that are overlapping?

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

    In botanical terms, what is 'quincuncial' preflowering?

    <p>'Vexillary' configuration with 5 flower pieces</p> Signup and view all the answers

    'Descendingly imbricate' is related to which specific part of a zygomorphic flower according to the text?

    <p>'Keel/Karina'</p> Signup and view all the answers

    'Pollen grain is produced inside pollen sacs' refers to which part of the male reproductive system of a flower?

    <p>'Stamens'</p> Signup and view all the answers

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