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Sperm (pl.: sperm or sperms) 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).
A human sperm cell consists of a flat, disc shaped head 5.1 μm by 3.1 μm and a tail known as a flagellum 50 μm long. [4] The flagellum propels the sperm cell (at about 1–3 mm/minute in humans) by whipping in an elliptical cone. [5]
Sperm storage organs in the fruit fly Drosophila melanogaster.Female was first mated with GFP-male and then re-mated with RFP-male. Female sperm storage is a biological process and often a type of sexual selection in which sperm cells transferred to a female during mating are temporarily retained within a specific part of the reproductive tract before the oocyte, or egg, is fertilized.
A 1992 World Health Organization report described normal human semen as having a volume of 2 mL or greater, pH of 7.2 to 8.0, sperm concentration of 20×10 6 spermatozoa/mL or more, sperm count of 40×10 6 spermatozoa per ejaculate or more, and motility of 50% or more with forward progression (categories a and b) of 25% or more with rapid ...
Only 1 in 14 million of the ejaculated sperm will reach the fallopian tube. The egg simultaneously moves through the fallopian tube away from the ovary. One of the sperm encounters, penetrates and fertilizes the ovum, creating a zygote. Upon fertilization and implantation, gestation of the fetus then occurs within the uterus. [11] [12] [13] [14]
The spermatids are transformed into spermatozoa (sperm) by the process of spermiogenesis. ... This page was last edited on 27 December 2024, at 10:55 (UTC).
The live virus cannot survive on surfaces for long, because “the virus needs a host to actually be effective,” Dahdal explains. “It needs to be in the human body to multiply and spread.”
They do not cause elevation of tumour markers and are usually diagnosed based on examination of tissue that has been removed after surgery. [9] Primary adenocarcinoma , although rare, constitutes the most common malignant tumour of the seminal vesicles; [ 19 ] that said, malignant involvement of the vesicles is typically the result of local ...