Which of the following is the function of an EKG?

The function of an EKG, also known as an electrocardiogram, is to record the electrical activity of the heart. This test measures the timing and strength of electrical signals as they travel through the heart, allowing healthcare professionals to assess heart rhythm, detect any abnormalities, and identify potential heart conditions. An EKG provides valuable information on the heart's health and is a crucial tool in diagnosing various cardiac issues like arrhythmias, heart attacks, and other heart-related problems.

In contrast, measuring brain activity is typically done through an EEG (electroencephalogram), while lung function assessments are usually performed using spirometry or other pulmonary function tests. Evaluating blood circulation can involve a range of diagnostic techniques, including Doppler ultrasound or angiography, but does not relate to the function of an EKG.