Final answer:
Ejaculation of semen involves peristalsis of the vas deferens and contraction of the ejaculatory ducts.
Step-by-step explanation:
The vas deferens, a muscular tube that carries sperm from the testes to the urethra, undergoes peristaltic contractions to propel sperm toward the urethra during ejaculation. Simultaneously, the muscles surrounding the reproductive organs, including the smooth muscles of the prostate gland and seminal vesicles, contract to release seminal fluid into the urethra.
This mixture of sperm and seminal fluid forms semen, which is then expelled from the pen*s during ejaculation. The coordinated action of peristalsis in the vas deferens and muscular contractions in the reproductive glands is essential for the successful expulsion of semen during the male reproductive process.