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| Q. |
The amplitude of EMG signals depend upon which of the following factor? |
| A. | Respiration |
| B. | Position of electrode |
| C. | Blood Resistivity |
| D. | Ventricular Volume |
| Answer» B. Position of electrode | |
| Explanation: The amplitude of the EMG signals depends upon various factors, e.g. the type and placement of electrodes used and the degree of muscular exertions. The needle electrode in contact with a single muscle fibre will pick up spike type voltages whereas a surface electrode picks up many overlapping spikes and therefore produces an average voltage effect. | |
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