Oct '11
1
MCAT Question of the Day | MCAT Course


  • Q:

    In the ear, sound is conveyed through the transfer of vibrational energy into the production of action potentials within specialized neuronal cells called hair cells. These cells are surrounded in a fluid called endolymph. Endolymph, unlike other bodily fluids, contains extremely high concentrations of potassium ions (K+). During excitation from vibrations, potassium flows into hair cells. Which of the following holds true regarding this phenomenon?

     

    A

    Hyperpolarization of the hair cells occurs, resulting in excitation of the cells

    B

    Sodium acts as the depolarizing agent for hair cells

    C

    Membrane potential of the hair cells drops upon stimulation

    D

    Hair cells become depolarized from the influx of potassium




    Tags: Nervous System | Sensory Processing | Suggest a tag
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