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  1. #1
    physionoob is offline Newbie 510 points
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    Physio HELP-Excitable cells, muscles

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    Hey.

    Just need a hand with these True/false questions:


    • Movement of electrons in the lipid bilayer results in electrical signals passing from one cell to another.

      False?
    • The plasma membrane can be represented electrically as a resistor and capacitor in parallel.

      False?
    • The lipids that comprise the plasma membrane have a high conductance, or low resistance, to current flow.

      False?
    • Ions in the extracellular solution are hydrated as a result of their hydrophobic chemical nature.

      True?
    • The intracellular solution of a nerve cell always has the same electrical potential as the extracellular solution.

      False?
    • The Ca2+/Na+ exchanger (counter-transporter) that couples Ca2+ efflux with Na+ influx, directly utilizes ATP as an energy source.

      False?
    • A K+ ion can only move across the membrane through an ion channel in a direction that is down its electrochemical gradient.

      False?
    • The Na+/K+/ATPase is an example of a secondary active transporter.

      False
    • The SGLT protein that couples Na+ influx with the movement of glucose into cells against its concentration gradient is an example of a facilitated diffusion protein.

      False
    • The hormone insulin is released from pancreatic beta-cells into the bloodstream by endocytosis

      True
    • In regards to the sliding filament theory; during sliding the A band shortens.

      False
    • Internal structure of skeletal muscle-The main elastic (spring) component is the endomysium

      False
    • Voltage-dependent K+ channels are open during the repolarization phase.

      False
    • Voltage-dependent K+ channels are closed during the afterhyperpolarization.

      False
    • Voltage-dependent K+ channels activate before the voltage-dependent Na+ channels.

      False
    • The voltage-dependent Na+ channels are inactivated when the action potential threshold is reached.

      False
    • Background or “leak” K+ channels are closed during the depolarization phase.

      True
    • There is a greater leak of local current flow across the cell membrane in an unmyelinated axon as compared to a myelinated axon

      False
    • Saltatory conduction, where the action potential “jumps” from node to node, only occurs in myelinated axons.

      True
    • In a normal unmyelinated axon, the action potential amplitude gets progressively smaller as it travels along the axon towards the nerve terminal.

      True

    • THANKS SO MUCH!!

    Last edited by physionoob; 04-02-2009 at 12:07 AM.

  2. #2
    tehmina is offline Junior Member 510 points
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    it was a great help

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