Which of the following is NOT a common indication for oxygen administration?

A 77-year-old female presents with an acute onset of altered mental status. Her son is present and advises that she has a history of hypertension, atrial fibrillation, type 2 diabetes, and glaucoma. He further advises that she takes numerous medications and that she is normally alert. When you assess this patient, it is important to note that:

A. because of her age and medical history, you should suspect Alzheimer disease. B. her mental status is likely the result of hypoglycemia and you should give her sugar. C. dementia typically presents as an acute onset of deterioration of cognitive function. D. the patient is experiencing delirious behavior, which suggests a new health problem.

The job of the cardiac conduction system's pacemaker is to

A) cause depolarization of myocardial cells. B) propagate electrical impulses. C) conduct electrical impulses. D) all of the above.