Final answer:
The instrument used to record electric currents generated by the brain is an Electroencephalogram (EEG). An Electrocardiogram (ECG) is used for recording the heart's electrical activity.
Step-by-step explanation:
The instrument used to record electric currents generated by the brain is called an Electroencephalogram (EEG). An EEG measures the electrical activity of the brain with an array of electrodes placed around the person's head. These measurements are crucial in examining the brain's function and diagnosing conditions such as epilepsy, sleep disorders, and brain tumors.
In routine physical exams, doctors test the electrical activity of the heart using a device called an Electrocardiogram (ECG or EKG). An ECG records the voltages created by cardiac depolarization and repolarization, vital for diagnosing and monitoring heart conditions. Standard ECG often uses a 12-lead setup to provide comprehensive electric potential recordings of the heart.