Structure of Nerve Cells Quiz
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Questions and Answers

Which part of the nerve axon lacks the myelin sheath?

  • Axon hillock
  • Central core of cytoplasm
  • Nodes of Ranvier (correct)
  • Axon terminal
  • What is the function of the Schwann sheath?

  • Acts as an insulator and protects the axon
  • Regenerates nerve fiber and forms myelin sheath (correct)
  • Provides structural support to the nerve axon
  • Aids in the transmission of electrical signals
  • Why are electrical stimuli preferred in practical experiments?

  • They are easy to detect without specialized equipment
  • They are similar to the natural signals inside the human body (correct)
  • They can induce both chemical and mechanical responses
  • They cause minimal damage to living tissue
  • What is excitability in the context of living tissues?

    <p>The ability to respond to a stimulus</p> Signup and view all the answers

    What are the factors that affect the degree of response to a particular stimulus?

    <p>The Rate of application and Strength of the stimulus</p> Signup and view all the answers

    What is the function of dendrites in a neuron?

    <p>Increase the surface area of the cell body and conduct nerve impulse towards the cell body</p> Signup and view all the answers

    What is the role of the axon in a neuron?

    <p>Conducts the nerve impulse away from the cell body and dendritic zone</p> Signup and view all the answers

    What is the function of Nissel bodies in a neuron?

    <p>Large triangular masses with high RNA content</p> Signup and view all the answers

    What does severe activity and anoxia cause in relation to Nissel bodies in a neuron?

    <p>Disappearance of Nissel granules (i.e. Chromatolysis)</p> Signup and view all the answers

    Why can a neuron never divide?

    <p>It doesn't contain a centrosome</p> Signup and view all the answers

    What makes up the structural unit of the nervous system?

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

    Which component of the nerve axon is responsible for regenerating nerve fibers and forming the myelin sheath?

    <p>Neurilemmal sheath</p> Signup and view all the answers

    What property of living tissue refers to its ability to respond to a stimulus?

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

    Which type of stimulus is preferred in practical experiments due to its similarity to the natural signals inside the human body and the ease of controlling its intensity?

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

    What is the minimal intensity of a current needed to stimulate excitation called?

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

    In the Strength-Duration curve, what is the time needed by a current of double the rheobase intensity to stimulate excitation?

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

    What does the Strength-Duration curve illustrate about the relationship between stimulus intensity and time needed for excitation?

    <p>Increasing stimulus intensity decreases the time needed for excitation</p> Signup and view all the answers

    What is the minimal time needed for a stimulus to produce a response called?

    <p>Minimal Duration (t)</p> Signup and view all the answers

    In diathermy, what effect does the use of high voltage alternating currents for a very short period of time cause?

    <p>Heating of tissues without stimulation</p> Signup and view all the answers

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