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nishakaur nishakaur
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9 years ago
Which of the following regarding the sinoatrial (SA) node is not true?

   
a)    It directly stimulates the atria, causing them to contract.
   
b)    The signal from the SA node reaches inexcitable tissue between the atria and ventricles.
   
c)    The signal from the SA node directly stimulates the ventricles.
   
d)    The SA node is the pacemaker of the heart
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Donated
Valued Member
9 years ago
c)    The signal from the SA node directly stimulates the ventricles.
It goes to the bundle of His and Purkinje fibers first.
Pretty fly for a SciGuy
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