Ejaculation occurs when muscle contractions propel sperm from the epididymes, and ejaculation is the expulsion of semen. Given these facts, the expulsion of semen occurs when what propels sperm from the epididymes among the following options:
- birth
 - muscle contractions
 - kinetic energy
 - urine
 - rapid expansion
 - air
 - heat produced
 - matter vibrating


 

  muscle contractions       