Two nursing students are reading EKG strips. One of the students asks the instructor what the P-R interval represents. The correct response should be which of the following?
a) "It shows the time it takes the AV node impulse to depolarize the atria and travel through the SA node."
b) "It shows the time it takes the AV node impulse to depolarize the ventricles and travel through the SA node."
c) "It shows the time it takes the AV node impulse to depolarize the septum and travel through the Purkinje fibers."
d) "It shows the time needed for the SA node impulse to depolarize the atria and travel through the AV node."
Answer: d) "It shows the time needed for the SA node impulse to depolarize the atria and travel through the AV node."
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