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Spermatogenesis begins after puberty and continues into adulthood. The rate of spermatogenesis slows when testosterone release reduces with age. Male menopause, on the other hand, does not exist. Period. Seasonally breeding animals, such as bats and otters, have a testicular cycle in which the testes and spermatogenous tissue only operate during the breeding season. During this season, the testes expand, become functional, and descend into the scrotum, whereas during other seasons, they contract, become non-functional, and ascend into the abdomen.
Human males, lions, bulls, horses, and other animals have their testes permanently located in the scrotum, and spermatogenesis occurs throughout their lifetimes; however, elephants, whales, and seals have their testes permanently located in the abdomen. Spermatogenesis is a continuous process that lasts around 2 months and 14 days. Days (74).
Spermatogenesis:
Spermatogenesis refers to the process through which males generate sperm from immature germ cells. It is discovered in the seminiferous tubules of the testes. During the process of spermatogenesis, a diploid spermatogonium (male germ cell) develops into a diploid primary spermatocyte. This diploid primary spermatocyte undergoes its first meiotic division (meiosis I), a reductional division that results in the formation of two equal haploid secondary spermatocytes. Each secondary spermatocyte undergoes the second meiotic division (meiosis II), which results in the creation of two equal haploid spermatids. As a result, a diploid spermatogonia gives rise to four haploid spermatids. Spermatids are transformed into spermatozoa during the process of spermiogenesis (sperm).
Formation of Spermatids:
Phase of multiplication: During this phase, gonocytes, diploid primordial germ cells present in the germinal epithelium of the seminiferous tubules of the testes, divide rapidly. Spermatogonia are sperm mother cells that are diploid and spherical in shape. Each spermatogonial cell is roughly 12 um in diameter and contains a prominent nucleus. Some spermatogonia (type A spermatogonia) act as stem cells, dividing and adding new cells to build a spermatogenic lineage, whilst others migrate in the other direction and enter the growth phase (called type B).
Growth phase: After the last spermatogonial division, a diploid spermatogonium doubles in size due to nutritive material accumulation in the cytoplasm, resulting in a diploid primary spermatocyte. The primary spermatocyte repeats its DNA throughout this period in preparation for meiosis. The diploid main spermatocytes undergo meiosis-1 (reduced division) and divide into two haploid cells called secondary spermatocytes, each with half the number of chromosomes.
Each secondary spermatotocyte initiates meiosis_ ii (equational division) immediately to produce two haploid spermatids. Each spermatid is a small spherical cell with a nucleus and cytoplasm that contains all of the cell organelles. As a result, each diploid spermatogonium produces four haploid spermatogonia.
Spermatogenesis is the production of sperm by immature male germ cells. It normally starts around adolescence and lasts until death, however there is a slight decrease in sperm count as people get older. The process of producing sperm is known as spermatogenesis. Mitotic divisions enable spermatogonia (2N) to develop and multiply on the inner side of the seminiferous tubules. They undergo mitosis, mature into primary spermatocytes, and eventually perish (2N). Each main spermatocyte undergoes meiosis, which results in the creation of two equal haploid secondary spermatocytes (N). In each secondary spermatocyte, a second meiotic division occurs, producing four equal haploid cells known as spermatids (N). Spermiogenesis refers to the process through which spermatids obtain nourishment to create sperm.
Conclusion:
As a result, we gained an understanding of spermatogenesis, its process, and the steps involved in this unit. As we previously knew, spermatogenesis is the process through which males generate sperm from immature germ cells. It is discovered in the seminiferous tubules of the testes. During the process of spermatogenesis, a diploid spermatogonium (male germ cell) develops into a diploid primary spermatocyte. This diploid primary spermatocyte undergoes its first meiotic division (meiosis I), a reductional division that results in the formation of two equal haploid secondary spermatocytes. Each secondary spermatocyte undergoes the second meiotic division (meiosis II), which results in the creation of two equal haploid spermatids. As a result, a diploid spermatogonia gives rise to four haploid spermatids. Spermatids are transformed into spermatozoa during the process of spermiogenesis (sperm).
