Final answer:
A monitor that a patient wears for 24 hours to continuously monitor heart electrical activity is called a Holter monitor. It is a small, portable, battery-operated device that is commonly used in clinical settings for diagnosing heart function.
Step-by-step explanation:
A monitor that a patient wears for 24 hours to continuously monitor heart electrical activity is called a Holter monitor. It is a small, portable, battery-operated device that is commonly used in clinical settings for diagnosing heart function. The Holter monitor uses electrodes placed on the patient's skin to record the electrical signals of the heart, providing valuable information for medical professionals. The term 'Holter' comes from the name of the inventor, Norman Holter.