The next month and a half or so his count was 93 million for the second round. Each one of these new cells will become a sperm cell. Tissues in the penis fill with blood and it becomes stiff and erect an erection. At birth, these tubules contain simple round cells, but during puberty, testosterone and other hormones cause these cells to transform into sperm cells. How Is Sperm Produced?
When the erect penis is stimulated, muscles around the reproductive organs contract and force the semen through the duct system and urethra.
How Is Sperm Produced?
Fungal Genetics and Biology. From the vagina, the sperm make their way up through the cervix and move through the uterus with help from uterine contractions. To understand how, you need to take a closer look at your own DNA. If a rival's sperm fertilizes an egg, then an opportunity to pass on your genes is lost. Humans are sexual, meaning that both a male and a female are needed to reproduce. The means that half of the sperm are female and half are male.