The production of sperm -- otherwise known as spermatogenesis -- generates more than 1,000 sperm per second in normal males. This productivity comes, in part, from a special cell type called the spermatogonial stem cell. The staying power of this stem cell has allowed many celebrities, including Robert DeNiro and Pablo Picasso, to father children after the age of 65.
Ukukhiqizwa kwezidoda - okubuye kubizwe ngokuthi i-spermatogenesis - kukhiqiza izidoda ezingaphezu kwe-1,000 ngomzuzu ngamunye emadodeni ngokuvamile. Lokhu kukhiqiza kwenzeka, njengengxenye, kuvela kuhlobo lweseli olukhethekile olubizwa nge-spermatogonial stem cell. Amandla okuhlala ale stem cell avumele ukuthi inqwaba yosaziwayo, okubandakanya uRobert DeNiro noPablo Picasso, babe woyise bezingane beneminyaka engama-65.