-- peristalsis refers to the waves of involuntary muscle
contractions that transport food, waste matter, or other contents
through a tube-shaped organ such as the intestine n the ductus
deferens (semen carrying tubes)
-- the ductus deferns are muscular tubes (surrounded by smooth
muscle) connecting the left and right epididymis to the ejaculatory
ducts in order to move sperm-rich semen. Each tube is about 30
centimeters long.
-- During ejaculation the wall of the vas deferens thickens and
thins itself, thus propelling the sperm forward.
