Michael n. comes to the emergency department complaining of chest pain, nausea, and shortness of breath. the diagnostic test ordered for this patient is a (n) a test that records electrical activity of his heart.

The answer to this question is electrocardiogram. Electrocardiogram or ECG is a test that records the patient’s heartbeat and checks the electrical activity of the patient’s heart. The electrodes that are placed on the skin of the patient to capture the magnitude of the heart’s electrical depolarization and to check any presence of heart muscle damage. 

It would be answer choice b (1975)