Vitiligo Definition and Overview. Vitiligo is an autoimmune skin disease in which there is a progressive destruction of the skinâs pigment-producing cells (melanocytes), resulting in areas of otherwise normal white skin devoid of melanin pigment. It is not unusual for hairs growing in areas of vitiligo to lose their normal color.
Sperm Cycle. Old sperm cells die off and new cells are created at a rate of about one percent each day. This means the entire sperm cycle requires approximately 100 days. The final 75 days represent a period of maturation for the sperm cell. This final step of sperm maturation, called spermiogenesis, puts the fuel into the tank and completes the development of the sperm cell (spermatozoon).
Sperm can live for 72 hours or more after being ejaculated. Acid conditions in the vagina kill half of the sperms.Note: Remaining half is more than 60 million sperms. Dead sperms travel as fast as the live ones. Sperms swim moving at the speed of 1 inch in 8 minutes. Mere few hundred will actually reach the egg. â¦ he body will never run out of it-the production process is always on the go. For a sperm cell to mature it will take about 60-70 days. Although there might still be sperm in the testes after ejaculation, it might take some time to release them as well (after initial release).