Urination will be caused by simultaneous:
| 1. | contraction of smooth muscle of bladder and relaxation of urethral sphincter |
| 2. | relaxation of smooth muscle of bladder and contraction of urethral sphincter |
| 3. | contraction of smooth muscle of bladder and urethral sphincter |
| 4. | relaxation of smooth muscle of bladder and urethral sphincter |

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