Final answer:
Spermatogenesis is the process of producing sperm that begins at puberty in the seminiferous tubules of the testes, activated by gonadotropin-releasing hormone.
Step-by-step explanation:
The event that activates the germ cells at puberty to produce spermatozoa is spermatogenesis. Spermatogenesis is the process by which sperm are formed in the testes of males and it begins at puberty. During spermatogenesis, cells known as spermatogonia undergo meiosis to produce haploid sperm cells or spermatozoa.
The site of spermatogenesis within the male reproductive system is within the seminiferous tubules of the testes. This process is continuous after it begins in puberty, lasting throughout a man's life, with a single production cycle taking approximately 64 days and new cycles starting roughly every 16 days. It is important to recognize that the activation of this process is due to gonadotropin-releasing hormone which stimulates Leydig cells to produce testosterone, an essential hormone in the process.
spermatogenesis, the origin and development of the sperm cells within the male reproductive organs, the testes. The testes are composed of numerous thin tightly coiled tubules known as the seminiferous tubules; the sperm cells are produced within the walls of the tubules.