Final answer:
In an electrocardiogram, 1 millivolt is standardized to equal 10 millimeters on the ECG paper, making option B the correct answer.
Step-by-step explanation:
When recording an electrocardiogram (ECG), the international standardization for amplitude is set at 1 millivolt (mv). This standardized amplitude corresponds to 10 millimeters (mm) on the ECG paper. Therefore, option B (10) is the correct answer. This standardization facilitates consistent readings across different machines and practices. ECGs record the electrical activity of the heart and are crucial for diagnosing various cardiac conditions. It is essential that the representation of the heart’s electrical activity is accurate and easily interpretable by medical professionals.