Sperm is the male reproductive cell , or gamete , in anisogamous forms of sexual reproduction forms in which there is a larger, "female" reproductive cell and a smaller, "male" one. Animals produce motile sperm with a tail known as a flagellum , which are known as spermatozoa , while some red algae and fungi produce non-motile sperm cells, known as spermatia. Sperm cells form during the process known as spermatogenesis , which in amniotes reptiles and mammals takes place in the seminiferous tubules of the testes. The spermatocytes then undergo meiosis , reducing their chromosome number by half, which produces spermatids. The spermatids then mature and, in animals, construct a tail, or flagellum, which gives rise to the mature, motile sperm cell. This whole process occurs constantly and takes around 3 months from start to finish.
Biological Processes that Prepare Mammalian Spermatozoa to Interact with an Egg and Fertilize It
Semen Production | BioNinja
Semen is a fluid secreted by the male gonads and functions as a transport medium for spermatozoa. Structures Contributing to Semen Production. The production of sperm and as a consequence, semen is controlled by three key hormones — FSH, LH and testosterone. Hormonal Control of Male Reproduction. Brent Cornell. Cell Introduction 2. Cell Structure 3.
Sperm Biology from Production to Ejaculation
NCBI Bookshelf. Molecular Biology of the Cell. New York: Garland Science; In most species, there are just two types of gamete , and they are radically different.