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| Q. |
The depolarisation of cardiac muscle cells is characterised by: |
| A. | a slow depolarisation, a plateau then a rapid repolarisation |
| B. | initial depolarisation due to a slow Na+ influx |
| C. | repolarisation due to K+ efflux through two types of K+ channels |
| D. | a plateau phase due to slowly opening Na+ channels |
| E. | calcium efflux during the plateau phase |
| Answer» D. a plateau phase due to slowly opening Na+ channels | |
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