McqMate
| Q. |
Considering conduction rates in myocardial cells, which statement is TRUE? |
| A. | Perkinje fibres are subepicardial and are the largest fibres, 4-7 times the width of other fibres |
| B. | Perkinje fibres are ‘fast fibres’, and can conduct a wave of depolarisation at a speed of 4m/sec |
| C. | the duration of the action potential and refractory period in fast fibres is shorter than slow fibres |
| D. | initial depolarisation occurs in fast fibres with a rapid influx of Ca2+ ions from the sarcoplasmic reticulum |
| E. | none of the above statements are true |
| Answer» B. Perkinje fibres are ‘fast fibres’, and can conduct a wave of depolarisation at a speed of 4m/sec | |
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