Getting to the right site:
Sperm:
- During ejaculation, the sperms are propelled from the urethra by peristaltic contractions of the vas deferens musculature.
- Sperm use their flagellum to move through the cervical canal.
- The enzyme vesiculase (from seminal vesicles) coagulates some of the semen to prevent backflow into the vagina.
- Fructose (from seminal vesicles) is an energy source for the sperm.
Notes:
It is not a 50/50 chance as to choosing the correct oviduct for a sperm. Sperm have a tropism for ova of their speciesóthey are attracted toward the ovum in the correct oviduct, making species-specific fertilization and fertilization in general more likely.