Q. The depolarisation of cardiac muscle cells is characterised by: (Solved)
1. a slow depolarisation, a plateau then a rapid repolarisation
2. initial depolarisation due to a slow Na+ influx
3. repolarisation due to K+ efflux through two types of K+ channels
4. a plateau phase due to slowly opening Na+ channels
5. calcium efflux during the plateau phase
- d. a plateau phase due to slowly opening Na+ channels