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What diagnostic test examines the impulses of nerve cells in the brain?
Electrocardiogram
Electroencephalogram
Ultrasound
X-ray
The correct answer is: Electroencephalogram
The diagnostic test that examines the impulses of nerve cells in the brain is the electroencephalogram (EEG). This test measures electrical activity in the brain through electrodes placed on the scalp, allowing healthcare professionals to assess brain function, diagnose conditions such as epilepsy, sleep disorders, and other neurologic problems. An EEG captures the brain's electrical signals, providing a visual representation of brain wave patterns. These patterns can help identify abnormalities in brain function, as different types of brain activity are associated with various mental states, such as alertness or sleep. In contrast, the other options serve different purposes: an electrocardiogram (ECG) monitors heart activity; ultrasound uses sound waves to create images of soft tissues or organs inside the body; and an X-ray is primarily used for imaging bones and detecting fractures. Thus, the unique capability of an EEG to record and interpret the electrical activity within the brain makes it the correct choice in this scenario.