Question

Which of the following can be used to make a stethoscope at home?
A. Rubber tube
B. Balloon
C. Funnel
D. All of the above

Answer 1

Hint: Stethoscope is a medical device used by doctors to hear the voice of internal organs like the heart. Listening to the internal sounds of the organ is called auscultation. A stethoscope is placed against the skin and it has a disc-shaped small resonator along with tubes that are connected to the earpiece.

Complete answer: An acoustic medical device used for auscultation is called a stethoscope. The term auscultation refers to listening to the sound of the internal organs of humans and animals. The stethoscope consists of a small resonator that is disc-shaped and two tubes that are connected to the ear. There are two types of stethoscopes. They are acoustic and digital. Stethoscopes can be made at home using a rubber tube, balloon, and funnel.
Steps to make a stethoscope at home are as follows.
1. Take a flexible tube and put the small end of the funnel inside the tube and push the funnel deep into the tube. To ensure the funnel is tightly fixed with the tube tape it with a suitable table.
2. Blow the balloon and cute the neck of the balloon and place it to the other open end of the funnel.
3. Tape it so that it is tightly attached to the funnel. The tympanic membrane of the stethoscope is formed by doing so.
4. Now place the end of the tube near the ear and funnel end against the heart to listen to the sound of the heartbeat.
Hence all of the above things mentioned in the options are used for making stethoscopes.

So, option D is the correct option.
Note: Stethoscope combined with a sphygmomanometer is used for measuring the blood pressure. A sphygmomanometer is a device which is actually used to measure the blood pressure of the heart. Phonendoscope is a device which intensifies the auscultatory sounds.