The death of cells, tissues, or organs. Necrosis may be caused by insufficient blood supply, pathogenic microorganisms, physical agents such as trauma or radiant energy (electricity, infrared, ultraviolet, roentgen, and radium rays), and chemical agents acting locally, acting internally after absorption, or placed into the wrong tissue.
The male gamete or reproductive cell involved in sexual reproduction. It is produced by a male organism that unites with the egg of a female organism forming a zygote. Supplement. A sperm is a cell consisting of a round or cylindrical nucleated cell, a short neck, and a thin motile tail.Its structure is vital to its mobility and function (i.e. sexual reproduction). The compacted nucleus contains half of the genetic information.t is produced by a male organism that unites with the egg of a female organism forming a zygote. Supplement. A sperm is a cell consisting of a round or cylindrical nucleated cell, a short neck, and a thin motile tail. Its structure is vital to its mobility and function (i.e. sexual reproduction).
The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.In mammals, sperm develops in the testicles and is released from the penis. uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium.