威斯东wisdom
中文名称：精子英文名称：sperm;spermatozoon精子定义：动物和低等植物成熟的雄配子。大小、形态因种类而异。所属学科：细胞生物学（一级学科）；细胞分化与发育（二级学科）精子分动物精子与植物精子。动物有性生殖过程中的雄性细胞，雄性动物的生殖细胞，异配生殖中的雄配子，由精子器产生的单倍体生殖细胞。而生活中精子更多是指男性成熟的生殖细胞，在精巢中形成。
他们的快乐
What is the difference between sperm and semen?Answer:Semen or seminal fluid is the whitish viscous fluid emitted from the male reproductive tract that contains sperm & liquids (seminal plasma) that help keep them viable. Sperm cells, produced by the testes in humans, represent 2 to 5 percent of semen volume; fluids from tubules, glands, & storage areas of the reproductive system bathe them as they travel down, nourishing them, keeping them motile, or participating in certain chemical reactions. During ejaculation, liquids from the prostate gland & seminal vesicles dilute the sperm & provide a suitable, slightly alkaline environment. An average ejaculation of a human male expels 0.1 to 0.3 cubic inches (2 to 5 ml.), containing 200 to 300 million sperm.Sperm is the smaller, usually motile male reproductive cell of most organisms that reproduce sexually. Sperm cells are haploid (they have 1/2 the No. of chromosomes as the other cells in the organism's body). Sperm often have at least 1 flagellum. During fertilization, the nucleus of a sperm fuses with the nucleus of the much larger oocyte (the female reproductive cell) to form a new organism. In male animals, sperm are normally produced by the testes in extremely large numbers in order to increase the chances of fertilizing an egg. Motile sperm cells produced by some multicellular protist groups (such as the algae), the bryophyte plants, & the seedless vascular plants, require water to swim to the oocyte. In gymnosperms and angiosperms, sperm do not need water for mobility but are carried to the female reproductive organs in the pollen grain. In the cycads and the gingko (both gymnosperms), the sperm are motile & propel themselves down the pollen tube to reach the egg cell. In the conifers and angiosperms, the sperm are not themselves motile but are conveyed to the ovule by the growing pollen tube. The human sperm cell is divided into a head that contains the nucleus, a mid-piece that contains mitochondria to provide energy for the sperm, & a flagellum that allows the sperm to move. When fertilization occurs, the nucleus & other contents from the sperm cells are drawn into the cytoplasm of the oocyte, but the mitochondria in the sperm are destroyed & do not survive in the zygote. Since mitochondria contain their own DNA (thought to be a relic from an existence as separate symbiotic organisms), all of the mitochrondrial DNA in humans is thus inherited from the female. The semen produced by the male reproductive tract act as a medium for sperm typically contains over 100 million sperm cells, all of which have but one purpose: to fertilize the single available oocyte.
亲爱的玉玉
口语中有时候将come，came之类的缩略成cum。
come 英[kʌm]美[kʌm]
v. 来；来到；到达，抵达(某地)；来做；来取；来拿。
int. (鼓励某人要有理智或通情达理，或表示不太赞同)嗨，得啦，好啦。
n. 精液；精子。
[例句]She had come to see the problem in a new light。
她开始用新的角度来看待这个问题。
[其他] 第三人称单数：comes现在分词：coming过去式：came过去分词：come。
come用法
1、come的基本意思是“朝某中心点接近、到达某地点或达到某种状态”。
2、come可以表示“来临，降临”，常用以指时间或事件按规律或自然法则等“顺理成章”地到来，也可指和他人在一起来参加某活动。
3、现在分词与come连用，可表示伴随动作〔状态〕，指某人或某事物按某种方式行进或某人在行进中做某事，也可表示目的。
4、come可以用作系动词，接形容词作表语，意思是“变得，成为”，常常指好的事情。例如：The situation will soon come clear。情况不久就会明朗的。
