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acyonkeu acyonkeu
wrote...
Posts: 16
Rep: 1 0
11 years ago

When vagus nerve stimulation was applied to the frog heart, _______.
    the force of contraction increased
    the force of contraction decreased and the heart rate slowed and eventually stopped
    the heart rate slowed and eventually stopped
    the force of contraction decreased
    the force of contraction increased and the heart rate slowed and eventually stopped

What part of your tracing illustrates vagal escape?
    the part where the heart rate slowed down
    the part where the force of contraction decreased
    the part where the heart resumed beating
    the part where the heart stopped

Research shows that in the absence of neural and hormonal influences, the SA node generates action potentials at a frequency of about 100 times per minute. However, the resting heart rate is about 70 beats per minute. What would the approximate heart rate be if the vagus nerve were severed?
    about 70 beats per minute
    slower than 70 beats per minute
    faster than 100 beats per minute
    about 100 beats per minute

Which of the following has the fastest rate of spontaneous depolarization?
    the SA node
    Purkinje fibers
    AV bundle branches
    the AV node
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acyonkeu Authoracyonkeu
wrote...
Posts: 16
Rep: 1 0
11 years ago
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