Discussion
Match the following :
| List I | List II |
|---|---|
| (a) Pneumograph | (i) Blood pressure |
| (b) Sphygmograph | (ii) Blood pulse volume |
| (c) Plethysmograph | (iii) Sweat conductivity |
| (d) Galvanograph | (iv) Respiration changes |
Answer: A
The correct match is a-iv, b-i, c-ii, d-iii.
These are the channels of a polygraph:
- Pneumograph: tubes around the chest and abdomen record respiration changes (iv).
- Sphygmograph (cardiosphygmograph): the cuff records blood pressure and pulse (i).
- Plethysmograph: records changes in blood volume in a finger, the pulse volume (ii).
- Galvanograph: records the galvanic skin response, the change in skin conductivity caused by sweating (iii).
Option B swaps the plethysmograph and galvanograph, and options C and D misplace the pneumograph, which records breathing, not blood pressure or pulse volume.
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