Question

The use of ultrasound waves to investigate the action of the heart is called
(A) ultrasonography
(B) echocardiology
(C) echolocation
(D) echocardiography

Answer 1

Hint: Ultrasound waves are sound waves with frequency higher than the upper limit of frequency that a human ear can hear. Cardiography refers to the graphic recording of the movement. So to investigate the action of the heart, Echocardiography is used.

Complete step-by-step solution
1. Ultrasonography: Ultrasonography is an imaging technique which is used to create an image of internal body structures such as muscles, joints, internal organs etc.
2. Echocardiology: Echocardiology is a diagnostic test that uses high-frequency sound waves which are not detectable by the human ear ,to produce images of the heart and its vessels.
3. Echolocation: Echolocation is the use of sound waves and echoes to determine where objects are in space.
4. Echocardiography: Echocardiography is a test that uses sound waves to produce live images of your heart. It shows the size, structure and movement of various parts of the heart.
So, from the above description we can understand, the use of ultrasound waves to investigate the action of heart is called Echocardiography.

Hence, the correct answer is option (D).

Additional Information
Human ear can hear sound between the range of 20 to 20,000 Hz. Sound waves above 20,000 Hz are called Ultrasound and below 20 Hz are called Infrasound.

Note: Read the question properly and see whether the question is related to action of heart or just the images of heart. Remember the difference between Echocardiology and Echocardiography. Don't get confused between them. Echocardiology provides us with images of heart while Echocardiography provides live movement of various parts of heart.