Final answer:
The correct answer is option d. An electrocardiogram (ECG) measures all electrical signals generated by the heart and provides important information about its functioning. It records the voltages created by the wave of depolarization and repolarization in the heart, and specific components like the P wave, QRS complex, and T wave can be analyzed to assess heart health.
Step-by-step explanation:
An electrocardiogram (ECG) measures all electrical signals generated by the heart. It records the voltages created by the wave of depolarization and subsequent repolarization in the heart. The ECG provides important information about the functioning and malfunctioning of the heart.
The ECG shows recognizable points such as the P wave (atrial depolarization), the QRS complex (ventricular depolarization), and the T wave (ventricular repolarization). By analyzing these components, medical professionals can assess the health and activity of the heart.
It's important to note that the ECG does not measure action potentials in contractile myocytes only, action potentials in the conduction system only, or the contraction of the atrial and ventricular myocytes. It captures the overall electrical activity of the heart.