Flashcards in HEALTH Using Sound Deck (17):
What material can sound not travel through?
What are the three main parts of a stethoscope?
Bell and tubes and earpiece
What does the bell do?
What does the tube do?
Carry the sounds to earpiece
What does the earpiece do?
Passes sound to doctor while blocking out background noise
What is an open bell used for?
Low frequency heart
What is the closed bell used for
High frequency lung
What is ultrasound?
Sound with a frequency above human hearing (20,000 hz)
Range of human hearing is
Give a use of ultrasound in medicine
For building up images of tissues inside the body
Give examples of noise pollution
Pneumatic drills, heavy traffic
What starts to damage hearing?
Pain threshold, Normal conversations, jet engine, heavy lorry, pneumatic drill, threshold. 0db, 60db, 95db, 100db, 130db, 140db
Explain how ultrasound is used
Ugly sound reflects off tissue boundaries in the patient. It takes different times for the sund waves to return from different depths and so an image of the patient can be built up using a computer. A layer of jelly is used to roe vent sound waves reflecting off skin.
Why must e bell if a stethoscope have as small a volume as possible?
To ensure sufficient pressure exchange at the ear
What are the advantages of ultrasound?
No surgery is needed, no harmful effects and saver than X-rays.