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______________ material is used to improve electrical contact in electrodes with the skin.

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______________ material is used to improve electrical contact in electrodes with the skin.

(a) Silver Tungsten

(b) Copper Tungsten

(c) Electrode jelly

(d) Silver Graphite

I got this question in an international level competition.

This key question is from Multi-Patient Telemetry topic in division Biomedical Telemetry of Biomedical Instrumentation

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Correct choice is (c) Electrode jelly

Explanation: If the electrodes are intended to be used under the skin of the scalp, needle electrodes are used. Electrode jelly or paste is used to improve the electrical contact.  They offer the advantage of reducing movement artefacts.

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