Mostrando entradas con la etiqueta Semen. Mostrar todas las entradas
Mostrando entradas con la etiqueta Semen. Mostrar todas las entradas

lunes, 5 de noviembre de 2012

Education Sperm Marathon 2012 - YOU ARE SPECIAL

 You are Special!

Although the world pushes you to run far away and impossible goals.
Remember, you already ran the biggest race of your life and....      YOU WON!


 

The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a new organism begins developing, starting as a totipotent zygote.[citation needed] 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.
Sperm quantity and quality are the main parameters in semen quality, which is a measure of the ability of semen to accomplish fertilization. Thus, in humans, it is a measure of fertility in a man. The genetic quality of sperm, as well as its volume and motility, all typically decrease with age.[4] (See paternal age effect.)
Market for human sperm.