71210 Bioelectromagnetism - Exercises Autumn 2004

Bidomain Model of Multicellular Volume Conductors

  1. Cardiac muscled cells are held together by "tight junctions". Cytoplasms of adjacent cells are connected through
    1. gap junctions
    2. connexons
    3. resistors
  2. In bidomail model
    1. the components are: intracellular space, extracellular space, and the separating membrane
    2. the entire tissue volume is represented as an equivalent volume with either isotropic or anisotropic conductivity
    3. more than two tissue types are modeled
  3. Long muscle fiber lying in oil is stimulated at one end of the fiber so that the current enters entirely into the intracellular space. Current is therefore restricted only to intracellular space. This statement is
    1. False
    2. True
  4. In determining experimentally the resistivity, a four-electrode impedance method is often applied. Four electrodes are used instead of two since
    1. electrode-tissue contact impedance is may then be ignored
    2. the output impedance of current generator is low enough
    3. both of the above

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