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Question
Ultrasonic waves are made to reflect from various parts of the heart and form the image of the heart. This technique is called:
Options:
A .  SONAR
B .  RADAR
C .  Ultrasonography
D .  Electrocardiography
Answer: Option D
:
D
In electrocardiography (also known as ECG or EKG), ultrasonic waves are made to reflect from various parts of the heart and an image of the heart is produced. For this, electrodes are placed on the skin of the limbs and chest. It helps to understand the irregularities in heart rythm.

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