This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
ScanSolve AI Answer
This text explains how an electrocardiograph (ECG) is calibrated to accurately record the heart's electrical activity. 1. Electrical Wave Recording: An ECG records an upward deflection (positive) when a depolarization wave moves towards the exploring electrode or when a repolarization wave moves away from it. The opposite occurs for downward deflections. 2. Amplitude (Vertical Axis) Calibration: The ECG is set so that a change of 1 mV (millivolt) produces a 10 mm amplitude deflection. This means each small square (1 mm) on the vertical axis of the tracing paper represents 0.1 mV. 3. Time (Horizontal Axis) Calibration: The standard recording speed is 25 mm per second. Consequently, each small square (1 mm) on the horizontal axis represents a duration of 0.04 seconds. A larger square (5 mm) therefore represents 0.2 seconds. That's 2 down. 3 left today — send the next one.