Final answer:
The ability of sperm cells to move along the ductus deferens is due to peristaltic contractions.
Step-by-step explanation:
The ability of sperm cells to move along the ductus deferens is due to peristaltic contractions.
Peristalsis refers to the rhythmic, involuntary contractions of smooth muscles that propel substances through tubes or hollow organs in the body. In the case of sperm cells, the smooth muscles lining the epididymal tubes contract, creating a wave-like motion that helps move the sperm along the ductus deferens.
These peristaltic contractions, along with other muscle contractions, propel the sperm from the epididymis to the urethra during ejaculation.