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The cardiac cycle

  1. Apr 5, 2010 #1
    I was struggling with the following question:

    In a frog heart preparation that is beating spontaneously, the longest part of the cardiac cycle involves:

    A. Contraction of the atria
    B. Contraction of the ventricle
    C. Relaxation of the ventricle
    D. Electrical conduction through the atrioventricular node
    E. Electrical conduction from the atrioventricular node to the ventricle

    i know in humans that the longest phase of the cardiac cycle is diastole, but im not sure what applies to a frog heart which is beating spontaneously (ie without autonomic input).

    thanks alot!
  2. jcsd
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