Q120
General ScienceBiology
ECG records
- a.rate of heart beats
- b.potential difference
- c.ventricular concentration
- d.volume of blood pumped
Answer: (B) potential difference
An electrocardiogram (ECG/EKG) records the tiny electrical potential differences generated on the body's surface by the heart's rhythmic electrical activity as it contracts and relaxes; heart rate is only one of several things that can be read off this recording, not what it directly measures.