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Flashcards in HEALTH Using Sound Deck (17):
0

What material can sound not travel through?

Vacuum

1

What are the three main parts of a stethoscope?

Bell and tubes and earpiece

2

What does the bell do?

Collects sounds

3

What does the tube do?

Carry the sounds to earpiece

4

What does the earpiece do?

Passes sound to doctor while blocking out background noise

5

What is an open bell used for?

Low frequency heart

6

What is the closed bell used for

High frequency lung

7

What is ultrasound?

Sound with a frequency above human hearing (20,000 hz)

8

Range of human hearing is

20hz-20000hz

9

Give a use of ultrasound in medicine

For building up images of tissues inside the body

10

Give examples of noise pollution

Pneumatic drills, heavy traffic

11

What starts to damage hearing?

90dB

12

Pain threshold, Normal conversations, jet engine, heavy lorry, pneumatic drill, threshold. 0db, 60db, 95db, 100db, 130db, 140db

0-threshold
60-normal convo
95-heavy lorry
100-pneumatic drill
130-jet engine
140-painthreshold

13

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.

14

Why must e bell if a stethoscope have as small a volume as possible?

To ensure sufficient pressure exchange at the ear

16

What are the advantages of ultrasound?

No surgery is needed, no harmful effects and saver than X-rays.

17

How can ultrasound break up kidney stones?

A concentrated beam that will not affect surrounding tissue