Which of the following conditions is associated with a woman who presents with hypertension (systolic blood pressure 160 mmHg, diastolic blood pressure 98 mmHg)

A first-degree heart block has a PR interval greater than 0.20 seconds because:

A) depolarization of the atria occurs at a slightly slower rate than one would expect. B) each impulse that reaches the AV node is delayed slightly longer than expected. C) impulses generated by the SA node traverse the AV node at an accelerated rate. D) the primary pacemaker is not the SA node, but rather an ectopic atrial pacemaker.

Home bleaching usually involves ____________

a. waiting weeks for results to show b. more cost to the patient versus other methods c. repeated visits to the dental office d. none of the above